OAKLAND (AP) — Friends of Barrett Clark, 35, say the popular sound engineer at the San Francisco club, The Bottom of the Hill, appeared to be everywhere.

Parker T. Gibbs, chief operating officer at Magnolia Media Productions, said when he’d walk into a rave full of strangers, he’d always spot Clark. “I knew where I’d be for the rest of the night,” Gibbs said. “Right next to him.”

Friends say the Santa Rosa native was also a DJ and “standup guy” — always ready to help musicians and fellow DJs.

Lynn Schwarz, co-owner of The Bottom of the Hill, said Clark was the engineer she hired to impress popular bands.

“You couldn’t shock the guy,” Schwarz said. “He had all kinds of friends.”