Jessica Tuchman Mathews is a distinguished fellow at the Carnegie Endowment for International Peace, and Emeritus Board Member at the Nuclear Threat Initiative. She served as Carnegie’s president for 18 years. Before her appointment in 1997, her career included posts in both the executive and legislative branches of government, in management and research in the nonprofit arena, and in journalism and science policy.

Jill Hruby was NTI’s inaugural Sam Nunn Distinguished Fellow, completing her year-long term in November 2019. Before joining NTI, she served as the director of Sandia National Laboratories from July 2015 through May 2017. Sandia is a Department of Energy/National Nuclear Security Administration national laboratory with diverse national security missions that include nuclear weapons, cyberspace, energy, non-proliferation, biological defense, and space.

A founding NTI staff member, Joan Rohlfing became president and chief operating officer of the Nuclear Threat Initiative in January 2010, after nine years as NTI's senior vice president for programs and operations.

Laura Kiefer, director of administrative operations, joined NTI in 2013. Kiefer contributes to both administrative and development efforts at NTI, providing administrative direction and assistance to the chief development officer and chief financial officer.

Ambassador Laura S. H. Holgate joined NTI as vice president for materials risk management in April 2018. She served as U.S. Representative to the Vienna Office of the United Nations and the International Atomic Energy Agency from July 11, 2016 to January 20, 2017.

Kimberly (Kimmie) Ross joined NTI in 2020 and serves as development associate.

Katherine Budeski joined the Nuclear Threat Initiative in 2018 as an intern and worked with NTI | bio as a consultant before becoming the Program Assistant for the Global Biological Policy and Programs team in September 2019 and later a Program Officer in 2021.