Over 25 years in comedy, Gary Gulman has established himself as an eminent performer and peerless writer. His most recent standup special for HBO, “The Great Depresh,” is a universally acclaimed, tour de force look at mental illness, equal parts hilarious and inspiring.A product of Boston, Gulman has been a scholarship college football player, an accountant, and a high school teacher. He has made countless television appearances as both a comedian and an actor.He is currently writing a memoir for Flatiron Books, tentatively titled “K Through 12.”