|2019-present||Director, Center for Food Safety and Security Systems (CFS3), University of Maryland|
|2009-present||Director, Joint Institute for Food Safety & Applied Nutrition (JIFSAN), University of Maryland|
|2006-present||Professor, Department of Nutrition and Food Science, University of Maryland|
|2001-2006||Associate Professor, Department of Nutrition and Food Science, University of Maryland|
|2001-2004||Director, Graduate Program in Food Science, University of Maryland|
|1996-2001||Assistant Professor, Department of Nutrition and Food Science, University of Maryland|
|1992||Ph.D. Comparative Pathology (major: Microbiology and Public Health; minor: Pathology), University of California, Davis|
|1989||Master of Preventive Veterinary Medicine (MPVM), University of California, Davis|
|1983||DVM, Veterinary Medicine, Sichuan Agricultural University, China|
Awards and Honors
|2019||Fellow, American Academy of Microbiology|
|2017||Fellow, Food Systems Leadership Institute, Association of Public and Land-Grant Universities|
|2013||FDA/CFSAN Recognition Award on iRisk Development|
|2013||The Dean Gordon Cairns Award for Distinguished Creative Work and Teaching in Agriculture, College of Agriculture and Natural Resources, University of Maryland|
|2010||Outstanding Service Award to the National Advisory Committee on Microbiological Criteria for Food, US Department of Agriculture|
|2010||FDA/CFSAN Director’s Special Citation Award on Aquacultural Foods|
|2010||FDA/CFSAN Exceptional Achievement Award on Food Safety Practices at Retail|
|2005||Commissioner’s Special Citation Award, the US Food & Drug Administration|
|NFSC631||Advanced Food Microbiology|
Our research interests include: 1) advanced molecular methods for identification and subtyping of pathogenic organisms; 2) mechanisms of antimicrobial resistance and resistance transfer among bacteria.
We perform whole genome sequencing to better understand molecular evolution and ecology of Salmonella, Shiga toxin-producing E. coli and other foodborne pathogens, and participate in GenomeTrakr network
The initiative holds the potential to dramatically improve public health globally.
We also conduct research on multidrug-resistant foodborne pathogens to elucidate the molecular mechanisms of antimicrobial resistance. Our work has helped determine associations of antimicrobial use in animal production environments with subsequent spread of resistant bacteria throughout the food chain.