“I tell people I’m a man with multiple callings,” said Dr. David Collymore, who is the medical director of a large social services organization but also a man of the cloth. “Medicine is one, church is another.”

When Dr. Collymore is not spearheading health efforts for the Acacia Network, whose affiliates include substance abuse treatment centers and nursing homes like Casa Promesa, a program in the Bronx for adults with H.I.V. and AIDS, he’s leading community initiatives for his church in Queens, where he is an associate pastor.