He graduated with a BS in physics and astronomy from Yonsei University in 2003 and received his optical sciences master’s (2008) and PhD (2009) from University of Arizona. His main research area includes large/aspheric/freeform optics fabrication and testing, including 7 × 8.4 m Giant Magellan Telescope primary mirrors. He serves as a journal editor and conference chair for OSA, CSA, and SPIE.