Visiting fellow Institute de Pathologie Cellulaire, Paris, 1969-1971, Christie Hospital, Manchester, England, 1971-1972. Visiting fellow John Curtin School of Medical Research, Canberra, Australia, 1972-1974. Assistant professor School Medicine Cornell University, New York City.
Director Bob Hipple Lab for Cancer Research, 1977-1985. Director hematology training program Sloan-Kettering Institute for Cancer Research, 1978-1979. Professor School of Medicine Wright State University, Dayton, since 1984.
President, Chief Executive Officer Hipple Cancer Research Center, 1985-1999. Chairman board directors AlphaMed Press, Inc., Dayton. Board directors Dayton Clinical Oncology Program.
Editor: In Vitro Aspects of Erythropoleis, 1978, Blood Cell Growth Factors: Their Biology and Clinical Applications, 1990, Blood Cell Growth Factors: Their Utility in Hematology and Oncology, 1991. Editor-in-chief International Journal Cell Cloning, 1982-1993, Stem Cells, since 1993. Executive editor The Oncologist.
Contributor articles to professional journals.