Boston Karma Kagyu Study Group is affiliated with Karma Triyana Dharmachakra Monastery, the North American seat of His Holiness the 17th Gyalwang Karmapa Ogyen Trinley Dorje. Karma Kagyu (Tibetan: ཀརྨ་བཀའ་བརྒྱུད, Wylie: karma bka'-brgyud), or Kamtsang Kagyu (Tibetan: ཀརྨ་ཀཾ་ཚང་, Wylie: kar+ma kaM tshang), is a widely practiced and probably the second-largest lineage within the Kagyu school, one of the four major schools of Tibetan Buddhism.[1] The lineage has long-standing monasteries in Tibet, China, Russia, Mongolia, India, Nepal and Bhutan, with current centres in over 60 countries. The spiritual head of the Karma Kagyu is the Gyalwa Karmapa; the 2nd among the 10 Karmapas had been the principal spiritual advisors to successive emperors of China.[2] The Karma Kagyu are sometimes called the "Black Hat" lamas, in reference to the Black Crown worn by the Karmapa.