Sang-shin Kwak received his Ph.D. degree in Electrical Engineering from Texas A&M University, College Station, TX, USA, in 2005. From 1999 to 2000, he worked as a research engineer at LG Electronics, Changwon, Korea. He was also with Whirlpool R&D Center, Benton Harbor, MI, in 2004. From 2005 to 2007, he worked as a senior engineer in Samsung SDI R&D center, Yongin, Korea. From 2007 to 2010, he was an Assistant Professor at Daegu University, Gyeongsan, Korea. Since 2010, he has been working at ChungAng University, Seoul, South Korea, where he is presently a Professor. His current research interests include the design, modeling, control, and analysis of power converters for electric vehicles and renewable energy systems as well as the prognosis and fault tolerant control of power electronics systems.