Zen Master Seung Sahn (1927–2004) was the first teacher to bring Korean Zen Buddhism to America, having already established temples in Japan and Hong Kong. In 1972 he came to the United States and started what became the Providence Zen Center, the first center in what is now the Kwan Um School of Zen, which now includes more than eighty centers and groups worldwide. His students called him Dae Soen Sa Nim, "Great Honored Zen Teacher," and he was the 78th Zen master in his line of dharma transmission in the Chogye order of Korean Buddhism. His books include The Compass of Zen, Dropping Ashes on the Buddha, Only Don't Know, and The Whole World Is a Single Flower: 365 Kong-ans for Everyday Life.

Hyon Gak Sunim, a Zen monk, was born Paul Muenzen in Rahway, New Jersey. Educated at Yale College and Harvard University, he was ordained a monk under Zen Master Seung Sahn in 1992 at Nam Hwa Sah Temple, the temple of the Sixth Patriarch, Guangzhou, People’s Republic of China. He has completed more than twenty intensive ninety-day meditation retreats and three arduous hundred-day solo meditation retreats in the mountains of Korea. He has compiled and edited a number of Zen Master Seung Sahn’s texts, including The Compass of Zen, Only Don’t Know, and Wanting Enlightenment Is a Big Mistake. He received inga from Zen Master Seung Sahn in 2001, and is currently guiding teacher of the Seoul International Zen Center at Hwa Gye Sah Temple, Seoul.