Gregg Weiner is the only South Florida-based actor who has the stage presence and physical instincts to sink himself into the skin of such a force of nature as Mark Rothko, the brilliant Russian-born American expressionist who's the subject of John Logan's one-act, semibiographical play Red. With a shaved head and middle-aged paunch, Weiner was grounded yet forceful as Rothko — a man so fraught with conviction he can't help but bludgeon his young assistant with overbearing speeches about art and its role as myth in society. Rothko could be an imperious, domineering personality, but Weiner, with his artful baritone inflection, nuanced humor, and genuine humanity, made the ornery artist a likable and oftentimes sympathetic figure. It's not easy bringing a troubled genius to life before a live audience night after night. It takes a robust, bombastic, yet adaptable actor to become someone like Rothko, yet Weiner pulled it off masterfully, and the result was another triumph for GableStage.