May 2018 - Stefan Hans-Klaus Ruhl Monday, May 7, 2018 0 3594 Stefan Hans-Klaus Ruhl is a Professor of Oral Biology and Adjunct Professor of Microbiology and Immunology University at Buffalo School of Dental Medicine. He earned his D.D.S. in 1984 and Ph.D. in 1988 from the University of Göttingen, Germany. His postdoctoral work took place from 1989-1994 at the National Institutes of Health in Bethesda, Md. Ruhl was Professor of Operative Dentistry and Periodontology at the University of Regensburg in Germany before he moved to the US in 2007. Read more