Professional Interest
Clinical interests include orthopedic and sports rehabilitation, particularly of the foot and ankle. Research focuses on three-dimensional motion analysis of the lower extremities in both athletes and non-athletes.
-Biomechanics of the lower extremities during running.
-Biomechanical basis for lower extremity injury in runners.
-Relationship between lower extremity joint structure and function during
running and walking.
-Effect of orthoses on lower extremity mechanics

Education History
Doctor of Philosophy, 1996-2000
University of Delaware, Newark, DE
Interdisciplinary Graduate Program in Biomechanics and Movement Science

Master of Physical Therapy, 1993-1996
University of Maryland, Baltimore, MD

Bachelor of Arts in Biology, 1988-1992
University of Virginia, Charlottesville, VA

Selected Publications
Laughton, C. A.; McClay, I. S. and Williams, D. S. (2002) "A Comparison of Three Different Methods of Obtaining a Negative Impression of the Foot." J Am Podiatric Med Assoc 92: 261-268.

Ferber, R.; McClay Davis, I.; Williams, D.S.; and Laughton, C. (2002) “A Comparison of Within and Between-day Reliability of Discrete 3-D Lower extremity Variables in Runners.” J Orthop Res 20: 1139-1145.

Williams D. S.; McClay, I. S.; Scholz, J. P.; Hamill J. and Buchanan, T. S. (2002) “Lower Extremity Stiffness in Runners With Different Foot Types.” Gait and Posture. (in review).

Ferber, R; McClay Davis, I. S.; and Williams, D. S. (2002) “Orthotics Alter Lower Extremity Joint Coupling and Variability: A Dynamical Systems Approach.” J Biomech (in review).

Ferber, R., McClay Davis, I., and Williams III, D.S. (2002). “Gender differences in lower extremity mechanics during running.” Medicine and Science in Sports and Exercise (in review).

Williams, D.S.;. McClay, I. S., and Hamill, J. (2001) “Arch Structure and Injury Patterns in Runners” Clin Biomech, 16: 341-347.

Williams, D. S.; McClay, I. S.; Hamill, J., and Buchanan T. S. (2001) “Lower Extremity Kinematic and Kinetic Differences in Runners with High and Low Arches.” J Appl Biomechanics, 17: 153-163.