David S. Buck, M.D., M.P.H., is Associate Dean for Community Health at the Tilman J. Fertitta Family College of Medicine. In addition, he serves as a clinical professor at the UT McGovern Medical School, and as an adjunct professor at The University of Texas Health Science Center School of Public Health and Rice University. He was professor at Baylor College of Medicine's Department of Family and Community Medicine for 21 years.

In 1984, he began working with the Houston’s underserved, developing medical and dental clinics for the indigent population, after working with Mother Teresa in Calcutta, India. In 1999, he founded Healthcare for the Homeless—Houston. In addition, Buck co-founded Doctor's for Change and served as its chair from 2006 to 2008. He founded the Houston-Galveston Albert Schweitzer Fellowship Program in 2007 and served as its chair from 2007 to 2016 and is currently chair emeritus. He served on the founding board and, later, as chair of the International Street Medicine Institute from 2010 to 2012. At the request of the U.S. Secretary of Health and Human Services, Buck served on the Consumer Operated and Oriented Plan Advisory Board from 2010 to 2012.

Buck currently leads the Patient Care Intervention Center, a nonprofit that leverages community-wide care coordination and technology to deliver resources to patients with complex social and medical needs. Additionally, Buck continues to serve as a practicing physician, including medical street outreach. Throughout his many leadership roles and practice, he has authored numerous peer-reviewed publications.

Buck is the recipient of many awards and honors including a 2018 honorary degree from Colorado College, the 2013 American Academy of Family Physicians Public Health Leader National Award, the 2012 Texas Academy of Family Physicians Public Health Leader Award, the 2011 St. Luke's Episcopal Charities Community Health Leadership Award and the 2010 University of Texas School of Public Health Leadership Luminary in Public Health. In 2012, Buck’s work was featured at the First Lady's Luncheon hosted by the Congressional Club to honor First Lady Michelle Obama in Washington D.C.