1963-1964	Research Associate in Pathology, University of Tennessee, Medical Units, Memphis
1970-1973	Assistant Professor of Microbiology, The Medical College of Wisconsin
1973-1976	Assistant Adjunct Professor of Microbiology, Medical College of Wisconsin
1976-1980	Associate Clinical Professor of Health Sciences, University of Wisconsin, Milwaukee
1976-1982	Associate Adjunct Professor of Microbiology, Medical College of Wisconsin
1980-1984	Clinical Professor of Health Sciences, University of Wisconsin, Milwaukee
1980-1985	Adjunct Professor of Biology, Marquette University
1982-1984	Adjunct Professor of Microbiology, Medical College of Wisconsin
1984-	Professor of Pathology (with tenure), University of Pittsburgh School of Medicine
1990-	Professor of Surgery (joint appointment), University of Pittsburgh School of Medicine

NON-ACADEMIC POSITIONS

1973-1974	Research Scientist, Milwaukee Blood Center
1974-1982	Director of Research and Development, The Blood Center of Southeastern Wisconsin
1982-1983	Director of Histocompatibility Research, The Blood Center of Southeastern Wisconsin
1984-1990	Director of Tissue Typing, Division of Clinical Immunopethogy, University of Pittsburgh
1984-1991	Co-Director, PERF Paternity Testing Laboratory, Pittsburgh
1984-1994	Director of HLA Laboratory, Central Blood Bank of Pittsburgh
1990-1995	Clinical Director, Central Laboratory Information Center, Presbyterian Hospital