The Hon. John Tien is a distinguished external fellow at the Georgia Tech Strategic Energy Institute and the Georgia Tech Research Institute. He is also a distinguished professor of the practice in both the Sam Nunn School of International Affairs and the School of Cybersecurity and Privacy and a senior fellow at the Belfer Center for Science and International Affairs at the Harvard Kennedy School. 

Before joining Georgia Tech, Tien was deputy secretary of the U.S. Department of Homeland Security (DHS) from 2021 to 2023. In that role, he was the DHS chief operating officer, overseeing a budget of $105 billion and facilities in all 50 U.S. states and all territories as well as more than 3,000 personnel stationed overseas in more than 75 countries. 

Alongside the secretary of Homeland Security, Deputy Secretary Tien led the policy development, operational oversight, and risk management of the department’s statutory mission areas and subordinate agencies, including cybersecurity and protection of America’s critical physical and cyber infrastructure; disaster preparedness and recovery; supply chain optimization, border security, and free and fair trade; air, pipeline, and rail security; maritime physical and cyber security; citizenship and immigration services; protection of senior officials and safeguarding the U.S. financial system; and counter-narcotics production and trafficking. 

In his broader policy administration role, Deputy Secretary Tien served as a member of the National Security Council’s Deputies Committee, the board of the National Counterterrorism Center, and the President’s Management Council. 

Upon his retirement from DHS in 2023, he was awarded two of DHS’ highest civilian awards: the DHS Distinguished Service Medal, and the United States Coast Guard Distinguished Public Service Medal. 

Tien previously served in the Obama administration as a National Security Council (NSC) senior director for Afghanistan and Pakistan, the Bush administration as an NSC director for Iraq, and the Clinton administration as a White House Fellow for the United States Trade Representative. 

From 2011 to 2021, he held various senior leadership positions at Citigroup as a managing director in their Citi Retail Services and Global Consumer Bank organizations. Before Citigroup, he was a U.S. Army officer, retiring at the rank of colonel. His Army career included commanding an 1,100-soldier armored task force in combat in Iraq, serving overseas for nearly a decade, and teaching political science at West Point. Col. Tien’s military awards and decorations include the Bronze Star Medal, Combat Action Badge, and Valorous Unit Award. 

Tien is now serving on the corporate board of directors for Union Pacific Railroad, on the Carter Presidential Center’s Board of Councilors, and as a founding board member of the Avalon Action Alliance, a nonprofit focused on nationally scaling proven healthcare programs to help heal veterans and first responders who struggle with depression, PTSD, and traumatic brain injury. He is also an executive partner and ambassador for the Master’s in Business for Veterans program at Emory University’s Goizueta Business School. 

Tien holds a B.S. in civil engineering from the United States Military Academy at West Point and an M.A. in philosophy, politics, and economics from Oxford University, where he was a Rhodes Scholar. He is a life member of the Council on Foreign Relations. He lives with his wife Tracy in Atlanta and volunteers with and supports numerous local civic institutions including the High Museum of Art.

Valerie Thomas is the Anderson-Interface Chair of Natural Systems and Professor in the H. Milton School of Industrial and Systems Engineering, with a joint appointment in the School of Public Policy. 

Dr. Thomas's research interests are energy and materials efficiency, sustainability, industrial ecology, technology assessment, international security, and science and technology policy. Current research projects include low carbon transportation fuels, carbon capture, building construction, and electricity system development. Dr. Thomas is a Fellow of the American Association for the Advancement of Science, and of the American Physical Society. She has been an American Physical Society Congressional Science Fellow, a Member of the U.S. EPA Science Advisory Board, and a Member of the USDA/DOE Biomass Research and Development Technical Advisory Committee. 

She has worked at Princeton University in the Princeton Environmental Institute and in the Center for Energy and Environmental Studies, and at Carnegie Mellon University in the Department of Engineering and Public Policy.

Dr. Thomas received a B. A. in physics from Swarthmore College and a Ph.D. in theoretical physics from Cornell University.

Yuanzhi Tang holds undergraduate degrees in Geology and Economics from Peking University, China. She earned a Ph.D. degree in Environmental Geochemistry at Stony Brook University and then continued working in the microbiology group of Prof. Colleen Hansel.

Tang joined the Georgia Tech faculty in 2013 as an assistant professor and is now an associate professor in the School of Earth and Atmospheric Sciences.

Phanish Suryanarayana joined the School of Civil and Environmental Engineering at the Georgia Institute of Technology in August 2011. He received his B.Tech. from Indian Institute of Technology, Madras, India in 2005. He obtained his M.S. in Aeronautics from California Institute of Technology in 2006. Subsequently, he received his Ph.D. in Aeronautics from California Institute of Technology in 2011 for his thesis titled "Coarse-graining Kohn-Sham Density Functional Theory". His research interests are in the areas of multiscale modeling, ab-initio calculations, density functional theory, continuum mechanics and smart materials. Overall, he is interested in developing efficient numerical methods for solving problems arising in a variety of fields. On a personal level, Dr. Suryanarayana is a sports enthusiast. He plays badminton, cricket, waterpolo, and ultimate frisbee. He also is an avid gamer (PC) and enjoys playing bridge and other board game

Dr. Stulberg is the Sam Nunn School Chair and Professor in the Sam Nunn School of International Affairs. He teaches undergraduate and graduate courses on international security, Russia/Eurasian politics and security affairs, nuclear (non)proliferation, and energy and international security, as well as inter-disciplinary courses on science, technology, and international security policy. His current research focuses on the geopolitics of oil and gas networks, energy security dilemmas and statecraft in Eurasia, Russia and "gray zone" conflicts, new approaches to strategic stability, internationalization of the nuclear fuel cycle, and implications of emerging technologies for strategic stability and international security.

Dr. Stulberg earned his Ph.D. in Political Science from the University of California, Los Angeles (UCLA), as well as holds an M.A. in International Affairs from Columbia University, an M.A. in Political Science from UCLA, and a B.A. in History from the University of Michigan. He served as a Political Consultant at RAND from 1987-1997, and as a Senior Research Associate at the Center for Nonproliferation Studies (CNS), Middlebury Institute of International Studies at Monterey (1997-1998). He has worked closely with former Senator Sam Nunn drafting policy recommendations and background studies on future directions for the U.S. Cooperative Threat Reduction Program, building regional and energy security regimes in Central Asia and the South Caucasus, and engaging Russia’s regional power centers. Dr. Stulberg was a post-doctoral fellow at CNS; policy scholar at the EastWest Institute; and has been a consultant to the Carnegie Corporation of New York and the Office of Net Assessment, Office of the U.S. Secretary of Defense. Dr. Stulberg has authored and edited five books, and has published widely in leading academic and policy journals.  In addition, he served on the Executive Committee of the Nuclear Nonproliferation Technical Group, American Nuclear Society (2012-14).

Dr. Stulberg maintains a conspicuous presence both inside and outside of the classroom at Georgia Tech. He is a two-time recipient of the INTA Graduate Student Association’s “Professor of the Year,” and has received the same honor from Sigma Iota Rho, the international affairs undergraduate honor society. Dr. Stulberg was a CETL teaching fellow, and a Hesburgh Teaching Fellow.  He also was the recipient of the 2010 Ivan Allen Jr. Legacy Faculty Award in recognition for his scholarship, as well as a “demonstrated commitment to serving students at the College, the Institute, and in the Community.”  Dr. Stulberg has served on numerous school, college, and campus-wide committees, including as Chair of the Sam Nunn-Bank of America Policy Forum (2008, 2010, 2012, 2014, 2016, 2020-21).  He was previously on the Faculty Advisory Board and is currently an Associate Director of the Strategic Energy Institute (a GT Institute-wide Center). In 2016, the Neal Family Endowed Chair was bestowed upon Dr. Stulberg; he was appointed Chair of the Sam Nunn School of International Affairs in July 2019.