Mañjushrimitra
Mañjushrimitra - One of the early masters of the Dzogchen lineage. He was a disciple of Garab Dorje and the main teacher of Shri Singha. He is famous for arranging the Dzogchen teachings into three classes: the Mind Class (sem dé), Space Class (long dé), and Pith Instruction Class (mengak dé). His last testament, which he conferred upon Shri Singha before passing into the rainbow body, is called the Six Experiences of Meditation.