Three park employees have or are about to depart Point Reyes National Seashore: John DiGregoria, the current range ecologist; Bill Shook, a planning and IT specialist; and Harold Geritz, a longtime equestrian manager at the Morgan Horse Ranch. Shook and Geritz are both retiring after long tenures; Shook previously served as a range ecologist and Geritz has worked at the seashore for nearly three decades. DiGregoria’s leave last Friday was less expected. “I don’t know…