Ralph P. Johnson has joined the San Diego office of PRC Guralnick as a naval architect, according to John L. Torresen, vice president and chief design engineer.

Mr. Johnson, a graduate of the University of Michigan, had been hull group supervisor at Campbell Industries, San Diego. His background includes five years' experience in the design of large tug, supply, and fishing vessels. A Navy veteran, he performed engineering duties for four years, and last served aboard the attack carrier USS Ranger as boiler officer.