A little out of date, here's his bio from KUSZ:
Hyon Gak Sunim JDPS is guiding teacher of the Seoul International Zen Center, Hwa Gye Sah Temple. A graduate of Yale College and Harvard University, Hyon Gak Sunim JDPS received novice monk precepts in 1992 at Nam Hwa Sah Temple, China, and received Bikkhu precepts in 1996 on the Diamond Precepts Altar at Tong Do Sah Temple, South Korea. He has been doing meditation training in remote mountain places, including three intensive 100-day solo retreats. He has compiled and edited several of Zen Master Seung Sahn's books, including The Compass of Zen (1997) and Only Don't Know (1999). He is author of the bestseller, Man Haeng: From Harvard to Hwa Gye Sah Temple (1999), as well as several bestselling translations into Korean of Zen Master Seung Sahn's English-language books.Hat tip to The Marmot's Hole for the video.