- 2018-present, Vice-Chancellor and President, The Chinese University of Hong Kong
- 2018-present, Lee Quo Wei and Lee Yick Hoi Lun Professor of Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong
- 2016-2017, Distinguished Visiting Professor and Director, Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong
- 2016-present, Member, Board of Trustees, Berea College
- 2014-present, Distinguished Professor of Orthopaedic Surgery, University of Pittsburgh
- 2012-2017, Associate Director, McGowan Institute for Regenerative Medicine, University of Pittsburgh
- 2012-2017, Founding Director, Center for Military Medicine Research, University of Pittsburgh School of Medicine
- 2012-2017, Visiting Professor, Shanghai Jiaotong University School of Medicine, China
- 2010-2020, Co-Director, Armed Forces Institute of Regenerative Medicine
- 2009-2020, Distinguished Professor of Orthopaedic Surgery, University of Pittsburgh
- 2009-2020, Professor, Department of Bioengineering and Department of Mechanical Engineering and Materials Science, University of Pittsburgh Swanson School of Engineering
- 2009-2020, Director, Center for Cellular and Molecular Engineering, University of Pittsburgh School of Medicine
- 2009-2017, Executive Vice Chairman for Orthopaedic Research, Department of Orthopaedic Surgery, & Arthur J. Rooney, Sr. Chair in Sports Medicine, University of Pittsburgh School of Medicine
- 2002-2010, Adjunct Professor, Department of Orthopaedic Surgery, Georgetown University School of Medicine, Washington D.C.
- 2002-2010, Adjunct Professor, Department of Orthopaedic Surgery, George Washington University School of Medicine, Washington D.C.
- 2001-2009, Chief, Cartilage Biology and Orthopaedics Branch, National Institute of Arthritis, and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda
- 1997-2003, Adjunct Professor, Biomedical Engineering, Drexel University, Philadelphia
- 1998-2001, Director, Cell and Tissue Engineering Ph.D. Program, Thomas Jefferson University
- 1996-2001, Vice-Chairman, Department of Orthopaedic Surgery, Thomas Jefferson University
- 1992-1995, Academic Director, M.D.& Ph.D. Program, Thomas Jefferson University
- 1988-2001, Director, Orthopaedic Research Laboratory, Thomas Jefferson University
- 1988-2003, Professor, Department of Orthopaedic Surgery & Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia
- 1980-1990, Assistant/Associate Professor/Adjunct Professor, Department of Biology, University of Pennsylvania, Philadelphia
- 1980, Instructor in Medicine, Harvard Medical School
|
