Derek Santos was designated Acting Associate Deputy Inspector General effective December 1, 2025. In this role, he exercises overall supervision of OIG’s business units, including the Offices of Investigations; Audits, Inspections and Evaluations; and Management, among other OIG functional activities.

Mr. Santos joined OIG as General Counsel in October 2024. In that capacity Mr. Santos directed the delivery of legal services for all OIG business units in their oversight of foreign assistance and development efforts worldwide.

Khadija Elaine Walker has 23 years of Federal oversight experience—1½ years at the USAID Office of Inspector General (OIG) and 21½ years at the U.S. Environmental Protection Agency (EPA) OIG. As Deputy Assistant Inspector General at USAID OIG, Ms. Walker leads five divisions that focus on Africa, Asia, IT, and financial oversight. Her teams work on such projects as the asset disposition of U.S. awards, oversight of foreign assistance in nonpermissive and war-torn environments, and assessments of foreign entities operations that use U.S. aid information and financial systems.