When the thirteenth century master Eihei Dogen, one of the most influential thinkers in Zen Buddhism and founder of the Japanese Soto school, returned to Japan after four years of study in China, the fruit of his pilgrimage was recorded in a collection of koans called the Chinese Shobogenzo, also known as Shinji or Mana Shobogenzo. This collection of three hundred main cases was first published in 1766 under the title Shobogenzo Sambyakusoku (Treasury of the True Dharma Eye: Three Hundred Cases), and was known to have provided the raw material for much of Dogen's better known Japanese-language Kana Shobogenzo. Dogen's collection of koans may come as a surprise to students of Zen as Dogen and the Soto school are generally known for the practice of shikantaza, or "just sitting," rather than for koan practice. Nevertheless, a careful study of Dogen's work reveals that he did use koans extensively in his writing and teaching, not only in the Kana Shobogenzo, but most of his other works as well. Zen students and scholars will find The True Dharma Eye to be a source of deep insight into the mind of one of the world's greatest religious thinkers, as well as the practice of koan study itself. Following the spirit of Dogen's pioneering efforts to carry the dharma across cultural divides, John Daido Loori Roshi, one of the West's most respected Zen teachers, has added his own verses and commentaries to each koan. The resulting volume presents readers with a uniquely contemporary perspective on Dogen's profound teachings and their relevance for twenty-first-century Western practitioners of Zen.

Dogen (1200–1253) is known as the founder of the Japanese Soto Zen sect.

John Daido Loori (1931–2009) was one of the West's leading Zen masters. He was the founder and spiritual leader of the Mountains and Rivers Order and abbot of Zen Mountain Monastery. His work has been most noted for its unique adaptation of traditional Asian Buddhism into an American context, particularly with regard to the arts, the environment, social action, and the use of modern media as a vehicle of spiritual training and social change. Loori was an award-winning photographer and videographer. His art and wildlife photography formed the core of a unique teaching program that integrated art and wilderness training by cultivating a deep appreciation of the relationship of Zen to our natural environment. He was a dharma heir of the influential Japanese Zen master Taizan Maezumi Roshi and he authored many books.

Kazuaki Tanahashi, a Japanese-trained calligrapher, is the pioneer of the genre of "one stroke painting" as well as the creator of multicolor enso (Zen circles). His brushwork has been shown in solo exhibitions in galleries, museums, and universities all over the world. Tanahashi has edited several books of Dogen's writings and is also the author of Brush Mind.