CH YING TOBDEN DORJ (1787-1848) was a brilliant Vajrayana master of eastern Tibet. His masterwork, The Complete Nyingma Tradition from Sutra to Tantra, remains the main text studied by Tibet's Ngakpa lineages of lay Buddhist yogi-practitioners. NGAWANG ZANGPO (Hugh Thompson) lives in Montreal. His translations include Jamg n Kongtrul's Retreat Manual, Enthronement, Sacred Ground, Guru Rinpoche, Timeless Rapture, Buddhism's Journey to Tibet, and Refining Our Perception of Reality. As a member of Kalu Rinpoche's translation committee- Myriad Worlds, Buddhist Ethics. With Lisa Stein- But n's History of Buddhism in India and Its Spread to Tibet.