Ken Dieffenbach serves as the Deputy Assistant Inspector General for Investigations at the U.S. Department of Energy OIG where he works with a team of over 80 individuals to tackle public corruption, contract, grant, and cyber fraud that impact the Department, including the National Nuclear Security Administration. He began his federal law enforcement career in 1996 with the Air Force Office of Special Investigations. From 2003 to 2021, he served in various roles at the U.S. Department of Justice OIG. Ken enjoys long walks in the woods and eating cheese.