Cooper Machinery Services (Cooper) has named David Tomes as vice president of used and refurbished equipment. Tomes has more than 40 years of experience in gas compression. He began his career as a Cooper mechanic in 1980, working globally on reciprocating engine-compressors. In 1996, Tomes moved to NRG Energy where he managed United States operations. Since 2010, he has owned his own compression business specializing in the overhaul and refurbishment of reciprocating equipment and parts for AJAX, Clark, Cooper-Bessemer, Ingersoll-Rand, Waukesha, and Worthington models.