Many great masters taught there : Dudjom Rinpoche , His Holiness Sakya Trizin , Gyalwang Karmapa , Tulku Urgyen Rinpoche and others . Many great masters taught there : Dudjom Rinpoche , when he taught for a whole month in London in 1979 , Sakya Trizin , Gyalwang Karmapa , Tulku Urgyen Rinpoche and others .