Pema Donyo Nyinche (b. 1954) is held by Tibetan Buddhists to be the twelfth incarnation of Tai Situpa Rinpoche and serves as abbot of Sherab Ling Monastery in northern India.
Of all the books I've read that are written by and about Tibetans, this one is the first to reveal intimate details of custom, tradition, and thought, giving insight into Tibetan culture difficult to find elsewhere.