David Aaron is a federal prosecutor in the Counterintelligence and Export Control Section of the U.S. Department of Justice National Security Division. He focuses on cases involving cyber intrusions, as well as espionage, economic espionage, and export control violations. David also serves as a liaison to the FBI’s Cyber Division and the National Cyber Investigative Joint Task Force. David started his career as an Assistant District Attorney in Manhattan, and has worked in several national security and computer crime-related capacities within the Department of Justice.

All statements of fact, opinion, or analysis expressed in the course of the fellowship are solely those of David Aaron and do not reflect the official positions or views of any other U.S. government agency.



Katherine Carroll is an attorney with expertise in financial institution regulation and national security policy.  From April 2016 to January 2017, Katherine served as Counselor to Secretary of Defense Ash Carter, providing advice and advancing the Secretary’s priorities in areas including cybersecurity and related intelligence community matters, the transfer of detainees from detention facilities at Guantanamo Bay, negotiations with Russia regarding potential cooperation in Syria, and development and implementation of the Secretary’s Force of the Future initiatives.

Prior to joining the Department of Defense, Katherine was a partner in the Washington office of Cleary Gottlieb Steen & Hamilton LLP.  Katherine’s practice in focused on advising major U.S. and foreign banks on U.S. bank regulatory matters, including the implementation of U.S. regulatory reforms, regulatory aspects of bank mergers and acquisitions, investments by private equity investors and others in banking organizations, and compliance with U.S. sanctions and anti-money laundering laws.

Prior to studying law, Katherine worked as the Executive Director of the Open Society Institute in Uzbekistan from 1996 to 1998. From 1993 to 1996, Katherine worked in the office of the Assistant Secretary of Defense for International Security Policy. Katherine received a J.D. degree from Yale Law School and an A.B. degree in Russian and Soviet Studies, magna cum laude, from Harvard College.


Jasson Casey is CTO and senior vice president of engineering at SecurityScorecard. An 18-year veteran in the telecom, computer networking, and security industries, Casey most recently ran the engineering department for IronNet Cybersecurity. He's an expert in software-defined networking and has helped define key technologies in carrier VoIP security and wireless mobility. Casey is a member of the Software Leadership Council and a research associate with the Open Networking Foundation.



Kate Charlet is the program director for Technology and International Affairs at the Carnegie Endowment for International Peace.  She works primarily on the

security and international implications of evolving technologies, with a focus on cybersecurity and cyber conflict; biotechnology; and artificial intelligence.

Charlet served in the Department of Defense for the last decade, most recently as the Acting Deputy Assistant Secretary of Defense for Cyber Policy, where she led the development of DoD cyber policy and strategy, the development cyber capabilities, and the expansion of international cyber relationships. 

Charlet is the recipient of the Secretary of Defense Meritorious Civilian Service Award and served in senior advisory roles on the Defense Science Board Task Forces on Cyber Deterrence, on Cyber as a Strategic Capability, and on the Presidential Commission on Enhancing Cybersecurity.

Prior to working cyberspace issues, Charlet served as the director for strategic planning at the National Security Council, led teams at DoD working Afghanistan strategy and policy, and conducted research on issues at the nexus of science & security at the Center for Strategic and International Studies.

Charlet holds degrees in Molecular Biology from Princeton University and International Relations / Strategic Studies from Johns Hopkins School of Advanced International Studies.



Nicolas Christin is an Associate Research Professor at Carnegie Mellon University, jointly appointed in the School of Computer Science and in Engineering & Public Policy. He is affiliated with the Institute for Software Research, and a core faculty in CyLab, the university-wide information security institute. He holds a Diplôme d'Ingénieur from École Centrale Lille, and M.S. and Ph.D. degrees in Computer Science from the University of Virginia. He was a researcher in the School of Information at the University of California, Berkeley, prior to joining Carnegie Mellon in 2005. His research interests are in computer and information systems security; most of his work is at the boundary of systems and policy research. He has most recently focused on security analytics, online crime modeling, and economics and human aspects of computer security.



Jacob W. Crisp is Co-Founder and Chief Executive Officer of Spotlight Cybersecurity LLC. Before launching Spotlight, Mr. Crisp was Majority Deputy Staff Director for National Security for the House Homeland Security Committee. He also served as Majority Policy Director and Deputy General Counsel for the House Permanent Select Committee on Intelligence (HPSCI). Prior to joining the HPSCI, Mr. Crisp was President’s Daily Brief (PDB) briefer to the White House with responsibilities for the Assistant to the President for Homeland Security and Counterterrorism, the Deputy Assistant to the President for Homeland Security, the Deputy Assistant to the President, Executive Secretary and National Security Council Chief of Staff, and the Special Assistant to the President and Senior Director for Intelligence Programs.

Previously, he worked as an officer at the Central Intelligence Agency on a range of intelligence-related issues, including operations, analysis, and support to covert action. He served in Africa, Europe, South Asia, the Middle East, and Oceania. Mr. Crisp previously worked on Capitol Hill as a Brookings Legis Congressional Fellow for then House Majority Whip Kevin McCarthy (R-CA).



Jennifer Daskal is an Associate Professor of Law at American University Washington College of Law, where she teaches and writes in the fields of criminal, national security, and constitutional law.  She also is currently an Open Society Institute Fellow, working on issues related to privacy, surveillance, and law enforcement access to data across borders.  From 2009-2011, Daskal was counsel to the Assistant Attorney General for National Security at the Department of Justice.  Previously, Daskal was senior counterterrorism counsel at Human Rights Watch, worked as a staff attorney for the Public Defender Service for the District of Columbia, and clerked for the Honorable Jed S. Rakoff.

Daskal is a graduate of Brown University, Harvard Law School, and Cambridge University, where she was a Marshall Scholar.  Her scholarship has appeared in the Yale Law Journal, Cornell Law Review, University of Pennsylvania Law Review, and Journal of National Security Law and Policy, among other places.  She has published op-eds in the New York Times, Washington Post, and International Herald Tribune, and has appeared on numerous media outlets, including MSNBC, NPR, NBC Nightly News, BBC, and C-Span. She is an Executive Editor of and regular contributor to the Just Security blog.



Craig Fowler is a native of Pittsburgh, PA and attended York College of Pennsylvania, graduating in 2000.  He attended the United States Navy’s Officers Candidate School in Pensacola, FL, receiving his commission as a Naval Officer in 2001.  Originally a Naval Aviator, he was selected for re-designation to Information warfare (now Cryptologic Warfare) in 2009.

Since Becoming a Cryptologic Warfare Officer, LCDR Fowler’s assignments have included tours at the NSA/CSS Threat Operations Center, U.S. Fleet Cyber Command / TENTH Fleet, and he assumed his present duties as the Deputy Joint Operations Center (JOC) Director and Deputy Operations Integration Branch Chief at U.S. Cyber Command in January of 2016.

His operational tours include deployments to the U.S. European Command AOR in support of Operation Active Endeavor, and to the U.S. Southern Command AOR in support of Counter Narcotics Operations.  LCDR Fowler also volunteered for an Individual Augmentation where as a member of Joint Counter Radio Controlled IED, Electronic Warfare (CREW) Composite Squadron One (JCCS-1), was embedded in multiple U.S. Army Units in support of Operation Iraqi Freedom.
LCDR Fowler has his Certified Information Systems Security Professional (CISSP) certification, and is currently pursuing his MBA in IT Management.



Summer Fowler is the Technical Director of Cybersecurity Risk & Resilience in the CERT Program at Carnegie Mellon University’s (CMU) Software Engineering Institute (SEI). Summer is responsible for a research and development portfolio focused on improving the security and resilience of the Nation’s critical infrastructure and assets. Summer has 17 years of experience in software engineering, cybersecurity, and technical management.

Prior to joining the SEI, Summer was a Technical Member at Johns Hopkins University Applied Physics Laboratory and a software engineer at Northrop Grumman Corporation. Summer holds a BS degree in Computer Science and a MS degree in Information Science/Telecommunications from the University of Pittsburgh.

Summer teaches two graduate level courses on Information Technology Project Management and Cybersecurity Policy at the CMU Heinz School. She is also the Technical Sponsor of the CISO Executive Certificate Program, and she helped to develop and teaches for an executive program educating Board of Directors members on cybersecurity oversight. She is extremely active in the local community as lead for Cyburgh, PA – an initiative to bring recognition to Pittsburgh as a leader in cybersecurity. Summer is also a member of the current Leadership Pittsburgh cohort, which educates current and future leaders on local challenges.



Eric L. Goldstein previously served as Branch Chief for Industry Engagement in the Department of Homeland Security’s Office of Cybersecurity and Communications, where he led the Department’s efforts to advance cybersecurity risk management with private sector, state, local, tribal, and territorial government partners. Eric is shortly joining the data security and privacy practice of an international law firm in Washington, D.C. 
Earlier, Eric served as Senior Counselor to the Under Secretary for the DHS National Protection and Programs Directorate. In this role, he led strategic cybersecurity initiatives to protect the Nation’s critical infrastructure and coordinated the development of innovative cybersecurity programs across the federal government. He also played a key role in coordinating DHS’s response to the OPM breach and in crisis communications with Congress. Prior to this position, Eric served as Senior Advisor to the Assistant Secretary for Cybersecurity and Communications and managed governance activities for the Continuous Diagnostics and Mitigation program, a government-wide initiative to identify and prioritize cybersecurity risks on federal networks.
Preceding his time at DHS, Eric served at the Homeland Security Studies and Analysis Institute (HSSAI), where he authored reports on cyber-physical convergence and on evaluating the efficacy of cybersecurity information sharing, among others. He previously held critical infrastructure protection, cybersecurity, and emergency management positions in the District of Columbia and the State of Illinois.



Davis Hake as a policy leader and entrepreneur, has worked across the government and private sector to strengthen our national cybersecurity. Currently, he is co-founding a new startup and launching the Center for Strategic and International Studies’ Presidential Cybersecurity Policy Recommendations. Previously, he served as Director of Cybersecurity Strategy at Palo Alto Networks, building and sharing the company’s strategy for cybersecurity thought leadership and threats in today’s security landscape. Prior to joining Palo Alto Networks, Davis served nearly a decade in the US government across the White House, Homeland Security (DHS), and on Capitol Hill.

At the White House, Davis coordinated interagency incident response for cybersecurity across. Gov and developed strategies for strengthening federal networks’ resilience. He also served as the principal advisor for the Deputy Undersecretary for Cybersecurity at DHS, where he managed a multitude of federal programs, industry partnerships, and strategic communications initiatives, including the launch of the Cybersecurity Framework.

Before joining the Administration, Davis was a leader in cyber and defense issues on Capitol Hill. Working for Congressman James Langevin from Rhode Island, he ran the Congressional Cybersecurity Caucus, educating policymakers on public-private partnerships, cyber defense, and digital privacy. Davis also drafted some of the first comprehensive cybersecurity legislation, for which he received a Federal 100 Award for leadership in the IT community.



Susan Hennessey is a Fellow in National Security in Governance Studies at the Brookings Institution. She is the Managing Editor of Lawfare, which is devoted to sober and serious discussion of "Hard National Security Choices.” She focuses on national security issues surrounding cybersecurity, surveillance, federal terrorism prosecutions, and congressional oversight of the intelligence community.

Prior to joining Brookings, Ms. Hennessey was an attorney in the Office of General Counsel of the National Security Agency. At the NSA, she advised operational elements on matters relating to Information Assurance and Cybersecurity and represented the Agency on cybersecurity legislation and related executive actions.

Hennessey received her J.D. from Harvard Law School and B.A. from the University of California, Los Angeles.



Ms. Randi Kieffer joined Capital One’s Corporate Audit Services Department in June 2017. She is responsible for cybersecurity within the Information Systems audit practice. She provides cybersecurity expertise and oversight as Capital One continues to implement its forward-thinking technology strategy.

Prior to joining Capital One Randi spent 12 years with the Department of Homeland Security in various cyber leadership roles. Most recently, she served as the Deputy Director of the National Cybersecurity Communications & Integration Center, the Federal Government’s main cybersecurity center for protection, prevention, incident response and recovery. Previously, Ms. Kieffer served as the Chief Information Security Officer for the Transportation Security Administration working to shift from a compliance emphasis towards a more operationally and cybersecurity focused agency.

Ms. Kieffer holds a M.A. degree in Computer Fraud Investigations and a B.A. Degree in Criminal Justice with a minor in Computer Science from The George Washington University. She also possesses a Master’s Certificate in Project Management, and is a graduate of the Senior Executive Fellowship program from the Harvard Kennedy School for Executive Education.



Daniel A. Lerner joined the Republican staff of the Senate Armed Services Committee in February 2009. In his current role as a Professional Staff Member, he serves as the staff lead for the Cybersecurity Subcommittee and the full Committee lead for Department of Defense-wide military cyber policy and programs, military space policy and programs, and United States Cyber Command. Prior to 2015, Daniel served as staff lead for budget policy, sequestration, and was the lead Republican staff member for intelligence programs. He has also been lead staff member for the Subcommittee on Strategic Forces, with oversight responsibility for missile defense, military space programs, cybersecurity, nuclear weapons, nuclear delivery vehicles, and U.S. Strategic Command, as well as lead staff member for the Subcommittee on Readiness and Management Support, with oversight responsibility for Department of Defense-wide Military readiness including training, logistics, and maintenance.

Prior to joining the Senate Armed Services Committee, Daniel served more than five years at the White House Office of Management and Budget (OMB) in the office of legislative affairs. Daniel received his Bachelor of Arts magna cum laude and with Honors in Political Science and Interdisciplinary Studies: Communication, Legal Institutions, Economics, and Government (CLEG) from American University in Washington, D.C.



Tim Maurer co-directs the Cyber Policy Initiative at the Carnegie Endowment for International Peace. His research focuses on cyberspace and international affairs, namely cybersecurity, human rights online, and Internet governance. Maurer is a member of several U.S. track 1.5 cyber dialogues and the Freedom Online Coalition’s cybersecurity working group “An Internet Free and Secure.” He was a member of the Research Advisory Network of the Global Commission on Internet Governance, co-chaired the Advisory Board of the Global Conference on CyberSpace in The Hague, and developed the Global Cyber Definitions Database for the chair of the OSCE to support the implementation of the organization’s cyber confidence-building measures. He co-authored “Tipping the Scale: An Analysis of Global Swing States in the Internet Governance Debate” published by the Global Commission on Internet Governance and Oxford Bibliographies’ ‘International Relations and Cyber Security’.

Prior to joining Carnegie, Maurer was the director of the Global Cybersecurity Norms and Resilience Project at New America and head of research of New America’s Cybersecurity Initiative. He also spent several years focusing on humanitarian assistance and the coordination of the UN system gaining experience with the United Nations in Rwanda, Geneva, and New York.



Jonathan Mayer is a Fellow at the Stanford University Cyber Initiative, currently detailed to the federal government. Since 2015 he has served as Chief Technologist of the Federal Communications Commission Enforcement Bureau, where his responsibilities include advising the Commission's leadership and senior staff on cybersecurity, surveillance, consumer privacy, and network neutrality. Jonathan is a PhD candidate at the Stanford University Department of Computer Science, and he holds a JD from Stanford Law School. He was selected in 2014 for the Forbes "30 Under 30" for his contributions to technology security and privacy.



Paul M. Mazzucco is a senior civilian policy and doctrine analyst in the Department of the Air Force. His work focuses on DoD organization and structure for cyberspace operations, including establishing U.S. Cyber Command (USCYBERCOM) as a Combatant Command and planning for increasing USCYBERCOM’s organic operational capabilities. Additionally, he helped the Office of Net Assessment develop a framework for a cyber-power net-assessment of the U.S. and a potential adversary.

Previously, he served in the Office of the Secretary of Defense (OSD) for Cyber Policy where he was primarily responsible for aligning cybersecurity responsibilities across the Department and the total force, developing policy positions for national interagency deliberations, and providing recommendations for how allied and partner nations could establish national cybersecurity programs. He also advised on and advocated for declassifying portions of the Senate Armed Services Committee Inquiry into Cyber Intrusions Affecting U.S. Transportation Command Contractors

Before his tenure at OSD, Mr. Mazzucco was an associate at Booz Allen Hamilton, advising the Department on joint systems engineering and on cybersecurity requirements for DoD information networks. Mr. Mazzucco holds Bachelor’s degrees in computer engineering and economics from the University of Maryland.



Matthew Noyes is the cyber policy advisor for the US Secret Service. In this role, he leads development of strategy and policy, primarily as it relates to conducting transnational cyber-crime investigations to protect the US financial sector and other critical systems. On behalf of the Secret Serve, he collaborates closely on these subjects with a wide range of policy stakeholders, including those in the Department of Homeland Security, interagency partners, the National Security Council Staff, and Congress. Matt also supports the Office of the Secretary of Defense for Cyber Policy as an Army Reserve Augmentee. His previous cybersecurity work includes teaching graduate school courses on cyber policy and work as a consultant on cybersecurity risk management. He previously served on active duty as an infantry officer stationed in Germany and deploying twice to Iraq, in 2007 and 2009; before joining the Army he worked as a software developer. Matt holds a master in public policy in international and global affairs from the Harvard Kennedy School and a bachelor’s degree in computer science and applied computational mathematics from the University of Washington.



Gabe Rottman is the director of the Technology and Press Freedom Project at the Reporters Committee for Freedom of the Press. Previously he was the deputy director for the Center for Democracy and Technology’s Freedom, Security and Technology Project, where he worked on issues at the intersection of civil liberties and technology, including cybersecurity and computer crime.

Following law school, Gabe was a litigation associate at Simpson Thacher & Bartlett LLP, focusing on antitrust and national security matters.  And, prior to and during law school, Gabe worked at the ACLU as a communications staffer and senior writer.

Gabe has testified before Congress on issues related to free speech and open government, and is frequently quoted in the media on technology and civil liberties matters.  He has written for numerous outlets, including the New York Times, Washington Post, Politico, CNN and Roll Call.

Gabe has a joint honors B.A. in political science and history from McGill University, and a law degree from the Georgetown University Law Center, where he graduated magna cum laude and was a Notes Editor on the Georgetown Law Journal.  He is a member of the bar in New York and Washington, D.C.



Brian D. Russo is a staff officer in the Office of the National Intelligence Manager for Cyber, in the Office of the Director of National Intelligence (ODNI).  His work includes coordinating operations with interagency counterparts, and facilitating the integration of intelligence and intelligence capabilities to address cyber threats to national security.  Previously at ODNI, Mr. Russo spent over three years in the policy division, developing Intelligence Community Directives and Intelligence Community Policy Guidance documents on a wide range of functions and topics.  Mr. Russo served as a division chief at the Defense Intelligence Agency (DIA), leading a division of analysts performing behavioral and social network analysis.

Prior to joining DIA as a civilian employee, Mr. Russo served in the U.S. Army for 20 years, as an infantryman, intelligence officer, and information operations planner.  His assignments included tours in Korea, Germany, Bosnia, Kosovo, and Afghanistan, and stateside duty at the U.S. Space Command, U.S. Strategic Command, 1st Information Operations Command, and the Office of the Under Secretary of Defense for Intelligence.  Mr. Russo received a Bachelor’s Degree in Political Science from Furman University in Greenville, South Carolina and a Master’s Degree in Management and Management of Information Systems from Webster University in Colorado Springs, Colorado. 



Jason Truppi is a career technologist turned FBI agent and now tech entrepreneur. Jason has many years of experience working in information systems and security. More recently, Jason was an FBI Cyber Agent in New York City where he worked some of the Nation's largest national security and criminal cyber intrusions. He was later promoted as Supervisory Special Agent in Washington D.C. where he was responsible for major data breaches, hactivism and cyber extortion cases across the country. As a Director at Tanium, Jason is helping to advance its security products to enable corporate network defenders on an even larger scale. He is applying his skills and experience in incident response, investigations, penetration testing, analysis and threat intelligence to help solve the cyber-crime epidemic that we face today.



Lisa Wiswell has worked for the better part of the past decade with the Department of Defense to shift its culture to interact more positively with the hacker community.  She presently works as the Digital Security Lead for the Defense Digital Service hacking the Department of Defense bureaucracy and its antiquated and restrictive policies and processes.  She was appointed Special Assistant to the Deputy Assistant Secretary of Defense for Cyber Policy in the Office of the Secretary of Defense where she supported senior DoD leaders by formulating and implementing policies and strategies to improve DoD’s ability to operate in cyberspace – specifically providing guidance and governance over the manning, training, and equipping of the Cyber Mission Force and developing offensive capabilities.  Prior to serving in the Obama Administration, she served as Technology Portfolio Manager at the Defense Advanced Research Projects Agency overseeing a portfolio of cyberwarfare initiatives directly contributing to national security.  Lisa started her career in Washington working on Capitol Hill for her home Member of Congress.

She holds a BA in History and Political Science from the Maxwell School of Public Citizenship at Syracuse University, and a Masters in Technology Management from Georgetown University.  Lisa is a privacy rights and STEM outreach advocate.