My research interests are in wireless communication, sensing, and low-power systems. Specifically, my Ph.D. work focuses on designing novel human sensing systems using light. My vision is that light can be a primary modality for fine-grained human sensing. Using small, cheap, and low-powered photodiodes around us, we can sense the light intensity change caused by the human blockage, reflection, and absorption and then infer fine-grained human behaviors and some biomarkers. My work on light-based sensing won MobiCom Best Video Award in 2015, and was selected as a Best Paper Nominee at SenSys 2017, SIGMOBILE Research Highlights in 2016 and 2018, and CACM Research Highlights in 2018. I have also received MobiSys Best Demo Award in 2015, VLCS Best Paper Award in 2014, and UbiComp Best Paper Nominee Award in 2014.