IDAHO FALLS, Idaho (AP) — The U.S. Department of Energy has named a new deputy manager to oversee cleanup and nuclear waste management at the agency's Idaho desert site. Jack Zimmerman has more than 25 years of experience in nuclear operations, project management and environmental management, including 18 years with the Department of Energy. Most recently, he served as program manager at the DOE's Portsmouth Paducah Project Office in Kentucky. The Post Register reports that Zimmerman will assume his new duties in July. He succeeds Jim Cooper, who will retire at the end of July. As deputy manager of the Idaho Operations office, Zimmerman will oversee 45 federal employees and nearly 3,000 contractor staff, who carry out environmental cleanup and nuclear waste management at the site.