Genshin (942-1017)

A Japanese Tendai priest and scholar who produced a significant corpus of works on a wide variety of Buddhist topics. He is known primarily as the author of the Ōjōyōshū, or ‘Essentials of Rebirth (in the Pure Land)’, a systematic survey of Chinese Pure Land literature that helped pave the way for the development of Pure Land as an independent school a century later. This work was also one of the few original Japanese works that travelled back to China and influenced the development of Buddhism there.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)