Timothy Walsh steps into role of Assistant Secretary for DOE's Office of Environmental Management.
Energy Technology Engineering Center
December 8, 2025
Timothy Walsh has taken over as the new head of the Department of Energy’s (DOE) Office of Environmental Management (EM). In October, Walsh stepped into the role of Assistant Secretary to provide strategic leadership for the safe and effective remediation of environmental legacies stemming from decades of nuclear weapons development and government-sponsored nuclear research.
Walsh is a seasoned engineering and construction executive with a military background, having served eight years in the U.S. Army Corps of Engineers, leading a platoon of combat engineers in Germany, overseeing construction projects in Turkey, and commanding a company of paratroopers in the 82nd Airborne Division during Operations Desert Shield and Desert Storm, for which he was awarded the Bronze Star.
In the private sector, Walsh directed construction of several large-scale, high-tech, fast‑tracked projects in the United States and Brazil for the semiconductor, biotechnology and telecommunications industries. He also co-founded a vertically integrated real estate development, construction and property management firm.