NTI Announces New Nuclear and Biosecurity Program Hires, Internal Promotions

Welcome to our new colleagues

NTI is pleased to announce the addition of three new experts to NTI’s nuclear and biological security teams. On February 1, Eric Brewer and Nickolas Roth join the newly named Nuclear Material Security Program as senior directors. Brewer comes to NTI from the Center for Strategic and International Studies, where he served as deputy director and senior fellow with the International Security Program’s Project on Nuclear Issues. Roth comes from the Stimson Center, where he served as senior fellow and director of the center’s Nuclear Security Program and its International Nuclear Security Forum. In addition, NTI | bio recently welcomed Aparupa Sengupta, who joined the team as senior program officer. Sengupta came to NTI from the University of California-Merced, where she served as Environmental Health and Safety assistant director and campus biosafety-biosecurity officer.

In fall 2021, NTI also welcomed Juliet Henry as a Communications Associate and Veronica Castro as an Administrative Operations Assistant.

NTI also is pleased to announce a number of recent staff promotions:

  • Mark Melamed was promoted to deputy vice president of the Global Nuclear Policy Program.
  • Scott Roecker was promoted to deputy vice president of the Nuclear Material Security Program.
  • Hayley Severance was promoted to deputy vice president of NTI | bio.
  • Rachel Staley Grant was promoted to deputy vice president of Communications.
  • Jaime Yassif was promoted to senior director and lead scientist for NTI | bio.
  • Jessica Bell was promoted to senior director for NTI | bio.
  • Ryan Cahill was promoted to digital director.
  • Jacob Eckles was promoted to senior program officer for NTI | bio.
  • Chris Isaac was promoted to program officer for NTI | bio.
  • Kimmie Ross was promoted to development associate.


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