Los Alamos National Labs with logo 2021

X Theoretical Design

Using state-of-the-art scientific theoretical, numerical, and experimental tools and methods to understand nuclear weapon design, performance, safety and surety, outputs and effects

Contact Us  

  • Division Leader
  • John M. Scott
  • Email
  • Deputy Division Leader
  • Leslie W. Sherrill
  • Email
  • Staff Operations Manager
  • Feliz R. Vigil
  • Email
  • Administrative Assistant
  • Karlie M. Romereau
  • Email
Image shows XTD staff viewing presentation.

XTD staff viewing presentation

A national resource for all aspects of nuclear weapons physics and design


Provide the nation with robust nuclear designs to deter existing or emerging threats.


  • Design any nuclear explosive and meet any requirement
  • Assess any nuclear explosive in any scenario


We are a highly professional organization that prioritizes learning, values scholarship, and challenges assumptions. We develop new solutions through vigorous, respectful, and enthusiastic scientific discourse.

Career opportunities

XTD Job Openings