Eihei Dogen, the founder of the Japanese branch of the Soto Zen Buddhist school, is considered one of the world's most remarkable religious philosophers. ''Eihei Dogen: Mystical Realist'' is a comprehensive introduction to the genius of this brilliant thinker. This thirteenth-century figure has much to teach us all--for the questions that drove him have always been at the heart of Buddhist practice. An ambitious book, ''Eihei Dogen: Mystical Realist'' is both intellectually challenging and enjoyable to read.