JP Sercel Associates (JPSA) has hired Randy Castillo as a field service engineer. Castillo formerly worked at Laser Advantage and previously for Honeywell, ESI and Laser Services. He also served as a communications specialist in the US Marines, working on Navy sonar systems and systems support. His responsibilities will include customer service and applications support. JPSA, of Manchester, N.H., makes excimer and diode-pumped solid-state industrial laser machining systems that operate at wavelengths of 157 to 1064 nm.