The Monk Doctor: 72, shaved bald and draped in flowing maroon robes, Barry Kerzin gently presses his stethoscope to the neck of an elderly Tibetan man. He’s just as gentle with this patient as he is with a much more famous one: his holiness the Dalai Lama.  The Tibetan spiritual leader now calls Kerzin, a tall, white California native, his messenger to the medical world – a journey that took a classically trained Western doctor halfway across the globe to become a buddhist monk.