1. Consultant, Department of Orthopedics, Mayo Clinic and Mayo Foundation; Associate Professor of Orthopedics, Mayo Medical School, Rochester, Minnesota.
2. Associate Consultant, Biomechanics Laboratory, Mayo Clinic and Mayo Foundation; Assistant Professor of Bioengineering, Mayo Medical School.
3. Director, Biomechanics Laboratory, Mayo Clinic and Mayo Foundation; Professor of Bioengineering, Mayo Medical School.