James W. Kerrigan has joined PDA Engineering...

James W. Kerrigan has joined PDA Engineering as vice president, finance and administration. He succeeds Clifford Mayotte, who is now working on special projects for the company. Kerrigan previously was vice president and chief financial officer of Ceradyne Inc. PDA also said Kevin Lehnert joined the company as controller. He succeeds Jack Spencer, who has left the company. Lehnert previously was finance manager of Hughes Aircraft’s engineering-related divisions. PDA Engineering, headquartered in Costa Mesa, designs, develops and markets mechanical engineering software and provides advanced technology products and specialized engineering services.