CISA Loses Cybersecurity Division Leader; Agency at One-Third Staffing

Shelly Hartsook, acting associate director of CISA's cybersecurity division who oversaw the CDM program, resigned effective March 6. Her departure follows the reassignment of CISA's acting director, and the exits of the CIO, CHCO, and threat hunting chief. CISA has lost approximately one-third of its workforce since January 2025 and operates without Senate-confirmed leadership. The agency is responding to the Stryker/Handala incident at severely degraded capacity.