Tim joined the SERI (now NREL) Site Operations group, formerly Facilities, in August 1982. He performed maintenance, operation, and repair on laboratory support systems, including some minor construction to install or retrofit various plumbing and electrical services in labs. As a mechanical/electrical technician Chief Engineer, Tim leads the maintenance crew at NWTC. Prior to joining NREL, Tim was a Machinist at the Denver and Rio Grande Western Railroad, where he repaired diesel locomotives. Tim also served as a Machinist Mate in the U.S. Navy.