She received her Bachelor’s degree from Texas Woman’s University in 1992 with a major in Biology and minors in Psychology and Chemistry. She later received her Master’s degree in Clinical Laboratory Science with an emphasis in Toxicology from the University of Texas Health Science Center in San Antonio and subsequently a Doctorate in Public Health from the University of Texas School of Public Health. Dr. Greenhill is a certified medical laboratory scientist. She joined MD Anderson Cancer Center (MD Anderson) in1994 as a student and has worked in both clinical and academic environments.