Yiru Xu is a Research Investigator in the Department of Dermatology Photoaging and Aging Research Program at the University of Michigan in Ann Arbor. He received his PhD in Microbiology from Medical College of Wisconsin in 1995 and his Bachelor of Science degree in biochemistry from Fudan University, Shanghai, P.R.China in 1989 and received his postdoctoral training at Vanderbilt University School of Medicine in Biochemistry. He was recruited to join the Dermatology Department in 1999. Dr Xu's current interest is in regulation of epidermal growth factor receptor function in human skin.