He is currently a Full Professor and Vice Chair of Electrical and Computer Engineering at the University of California San Diego (UCSD), where he is also the co-Director of the Center for Wearable Sensors and the Site Director of the Power Management Integration Center. His research interests include the design of energy-efficient microsystems, focusing on the design of RF circuits, power converters, and sensor interfaces for miniaturized systems and biomedical applications.

Prof. Mercier has published over 200 peer-reviewed papers, including 30 ISSCC papers, 34 JSSC papers, and several papers in high-impact journals such as Science, Nature Biotechnology, Nature Biomedical Engineering, Nature Electronics, Nature Communications, Advanced Science, and more. He has received numerous awards, including a Natural Sciences and Engineering Council of Canada (NSERC) Julie Payette fellowship in 2006, NSERC Postgraduate Scholarships in 2007 and 2009, an Intel Ph.D. Fellowship in 2009, the 2009 IEEE International Solid-State Circuits Conference (ISSCC) Jack Kilby Award for Outstanding Student Paper at ISSCC 2010, a Graduate Teaching Award in Electrical and Computer Engineering at UCSD in 2013, the Hellman Fellowship Award in 2014, the Beckman Young Investigator Award in 2015, the DARPA Young Faculty Award in 2015, the UC San Diego Academic Senate Distinguished Teaching Award in 2016, the Biocom Catalyst Award in 2017, the NSF CAREER Award in 2018, a National Academy of Engineering Frontiers of Engineering Lecture in 2019, the San Diego County Engineering Council Outstanding Engineer Award in 2020, the ECE Teacher of the Year Award in 2023, and the ISSCC Author Recognition Award in 2023. He has served as an Associate Editor of the IEEE Transactions on Very Large Scale Integration (TVLSI), the IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), and the IEEE Solid-State Circuits Letters. He is currently a member of the Executive Committee of ISSCC, and has served on the technical program committees for ISSCC, CICC, and the VLSI Symposium. Prof. Mercier was the co-editor of Ultra-Low-Power Short Range Radios (Springer, 2015) Power Management Integrated Circuits (CRC Press, 2016), and High-Density Electrocortical Neural Interfaces (Academic Press, 2019).