Dr. Walker is a Senior Researcher at Merck Research Laboratories in the Department of Imaging Research and Integrative physiology. Dr. Walker conducts research and manages a group of scientists dedicated to dynamic systems level vascular biomarkers discovery at the structure/function interface of metabolic-disorder related diseases. He and his Team use novel 3D-4D-micro-ultrasound and optical imaging approaches to drug discovery (Phases I-IIB, IV).

Dr. Walker was a mechanical engineer with NASA-Houston, TX, prior to receiving his Ph.D. in Cardiovascular Biophysics from Tulane University School of Medicine. At Tulane, he worked in cardiovascular/renal physiology and pharmacology under the direction of Dr. L. Gabriel Navar (Past President of the Am. Physiological Society). Dr. Walker continued his post doctoral education in dynamic imaging of intracellular signaling, systems biology and angiogenesis at Harvard University and MIT in the Division of Health Science and Technology, under Elazer R. Edelman, M.D., Ph.D.

Dr. Walker continues as an adjunct faculty member at Harvard-MIT, is member of the New England Board of Higher education, New York Academy of Sciences, Sigma Xi Honorary, and multiple other scientific societies. His publications focus on molecular imaging and control systems physiology in atherosclerosis, diabetes, obesity and hypertension. Dr. Walker lives in New York City (Manhattan).