Chien-Sheng Liu received his BS and MS degrees from the department of power mechanical engineering at National Tsing Hua University, Hsinchu, Taiwan, in 1996 and 1999, respectively, and his PhD degree from the department of mechanical engineering at National Cheng Kung University, Tainan, Taiwan, in 2010. He worked at the Industrial Technology Research Institute (ITRI), Taiwan, as a mechanical design engineer from 2003 to 2011. He was an assistant professor in the department of mechanical engineering at National Central University, Jhongli, Taiwan, from 2011 to 2012 and joined the mechanical department at National Chung-Cheng University, Chiayi, Taiwan, in 2012. He has been a professor in the department of mechanical engineering at National Cheng Kung University, Tainan, Taiwan, since 2018. His current research interests include applications of force sensors, voice coil motors, precision measurement, laser-based auto-focusing modules, and opto-electronics sensing.