2007-Present: Executive Director; Pennsylvania Human Implant Performance Laboratory, Philadelphia, PA
1997–Present: Associate Professor of Orthopaedic Surgery, School of Medicine, University of Kentucky
1997-Present: Associate Professor of Biomedical Engineering, Center for Biomedical Engineering, University of Kentucky
2000-2010: Research Staff Member, Shriners Hospital for Children, Lexington, KY
1996-1997: Research Committee Member, Kentucky Spine Institute, Lexington, KY
1991-2000: Director, Orthopaedic Biomechanics Laboratory, University of Kentucky
1991-1997: Assistant Professor of Orthopaedic Surgery, School of Medicine, University of Kentucky
1991-1997: Assistant Professor of Biomedical Engineering, Center for Biomedical Engineering, University of Kentucky
1987-1991: Adjunct Assistant Professor of Orthopaedic Surgery Research, School of Medicine, University of Pennsylvania, Philadelphia, PA
1989: Vice-President of Research, IatroMed Inc., Phoenix, AZ
1987-1989: Vice-President of Clinical Research, LTI Biomedical Inc., San Diego, CA
1984-1987: Visiting Scholar, Department of Orthopaedic Surgery, School of Medicine, University of Pennsylvania, Philadelphia, PA
1982-1987: Director of Research and Development: Orthopaedic Products, La Jolla Technology Inc., San Diego, CA