Maitripa (986-1063) is one of the greatest and most influential Indian yogis of Vajrayana Buddhism. The legacy of his thought and meditation instructions have had a profound impact on Buddhism in India and Tibet, and several important contemporary practice lineages continue to rely on his teachings. Early in his life, Maitripa gained renown as a monk and scholar, but it was only after he left his monastery and wandered throughout India as a yogi that he had a direct experience of nonconceptual realization. Once Maitripa awakened to this nondual nature of reality, he was able to harmonize the scholastic teachings of Buddhist philosophy with esoteric meditation instructions. This is reflected in his writings that are renowned for evoking a meditative state in those who have trained appropriately. He eventually became the teacher of many well-known accomplished masters, including Padampa Sangye and the translator Marpa, who brought his teachings to Tibet. Drawing on Maitripa's autobiographical writings and literary work, this book is the first comprehensive portrait of the life and teachings of this influential Buddhist master. Klaus-Dieter Mathes also offers the first complete English translation of his teachings on nonconceptual realization, which is the foundation of Mahamudra meditation.