He is a Full Professor in the Department of Kinesiology and Sport Management at Texas Tech University. My research interests are endothelial function, arterial stiffness, aortic hemodynamics, wave reflection, muscle metaboreflex activation in hypertension, obesity, aging, sarcopenia, dynapenia, and type 2 diabetes using nutritional and exercise interventions, such as L-citrulline supplementation and resistance training in middle-aged and older adults.