Jimmy Yu (a.k.a. Guo Gu) was the bassist for the American 1980s hardcore bands, (the original) Death Before Dishonor and Judge. After his hardcore straight edge days, he returned to Buddhism and became a monk under Chan/Zen Master Sheng Yen. In 2000, he left monasticism to pursue academia. He received an MA degree in Chinese Buddhist studies from University of Kansas in 2002 and a Ph.D. from Princeton University's Department of Religion in 2008.
He is currently an Assistant Professor of Religion at Florida State University, teaching courses in East Asian religious traditions, especially Chinese Buddhism and late imperial Chinese cultural history. His research interests include the cultural history of the body, Buddhist monasticism, Chan/Zen Buddhism, and popular religions within the broader context of fifteenth to seventeenth centuries China.
Jimmy Yu is also a long-time practitioner of Chan/Zen. His Dharma name is Guo Gu. He began practicing with the late Chan Master Sheng Yen in 1982 until the later died in 2009. Guo Gu was Sheng Yen's translator, attendant, and assistant in leading intense Chan retreats. He first received inka, seal of approval for his experience of Chan, in 1995 by Sheng Yen and has subsequently received several inkas from him--the last one being 2007. He is currently the Dharma teacher of the Tallahassee Chan Group in Tallahassee, Florida.
Here is a 2008 Double Cross Hardcore fanzine interview with Jimmy Yu in which he talks about growing up in the hardcore scene and playing in Judge.