Juan Antonio Zapien is Associate Professor at the Department of Materials Science and Engineering of City University of Hong Kong. He was born in the state of Michoacan in Mexico and received his Physics degree from the National Autonomous University of Mexico (UNAM) in 1994 and his Ph. D. degree from The Pennsylvania State University (Penn State, USA) in December 2000 working under the co-supervision of Professors Russell Messier and Robert Collins. His research interests include self-assembled nanomaterials for applications in sensing, energy conversion, light emission, and harvesting; advanced quantitative optical modeling of light-matter interactions in photonic and plasmonic devices for spectroscopic techniques (SERS, BSW, radiometric, and hybrid) with improved specificity, sensitivity, and quantification of biochemical and environmental sample analysis; and optical detection and imaging strategies to investigate nano-bio interactions at the molecular and cellular levels. He has published three book chapters and 210+ publications with more than 12,000 citations and h-index 57 (Scopus Author ID: 6701453903). He has participated as invited speaker in more than 40 international conferences and is involved as organizer of several workshops and scientific conferences in Mexico, the United States, and Hong Kong.