John Rosselot has taken on a new role as Deputy Chief Information Security Officer (Deputy CISO) at the U.S. Secret Service, bringing federal cybersecurity and risk management experience from roles across the Department of Agriculture and Department of the Army.
Rosselot previously served as Information System Security Manager (ISSM) at the Secret Service beginning in June 2026 before moving into the Deputy CISO position.
Before joining the Secret Service, Rosselot served as Branch Chief of the Risk Management Branch and Deputy CISO at the Department of Agriculture’s Food and Nutrition Service. In that role, he led enterprise-wide risk management strategy and cybersecurity compliance for mission-critical applications, supporting adherence to federal cybersecurity requirements and frameworks.
His work included managing Risk Management Framework (RMF) processes, supporting Authority to Operate (ATO) efforts, advancing cloud migration strategies aligned with FedRAMP and TIC 3.0, and implementing supply chain risk management practices based on NIST guidance.
Rosselot previously served as an Information Technology Specialist and Information System Security Officer with the Department of the Army’s Human Resources Command. There, he supported cybersecurity operations for more than 50 mission-critical Army HR applications across multiple networks, safeguarding sensitive personnel information.
During his Army service, Rosselot led vulnerability management efforts, supported continuous monitoring programs, coordinated cybersecurity controls throughout software development processes, and helped maintain compliance across Army systems.
Earlier in his career, Rosselot held a variety of Army human resources and information systems roles, supporting personnel systems, policy implementation, system modernization, and data security initiatives.
