Research Team

The Staff That Is Making A Difference In Medical Research

DHAT Research Institute, a division of Digestive Health Associates of Texas, P.A., brings the future of gastroenterology medicine to Adults and Pediatrics in the Dallas-Fort Worth area. We strive to provide all patients, current and new, with access to cutting edge treatments prior to them being granted FDA approved.

For new treatments and therapies to receive FDA approval, the investigational product must pass through four different phases: Phase 1, Phase 2 and Phase 3, are pre-FDA approval, while Phase 4 is considered post-FDA approval. DHAT Research Institute participates in all four Phases, 1 through 4, with our primary focus in Phase 2 and Phase 3 of the clinical research testing phase.

Harry Sarles, Jr., MD

Harry Sarles, Jr., MD

Medical Director / Principal Investigator


Mark Miller, MD

Mark Miller, MD

Sub-Investigator

Son T. Do, MD

Son T. Do, MD

Sub-Investigator

Matthew Burkemper, BA, CCRC

Matthew Burkemper, BA, CCRC

Senior Research Director

Priscilla Page, FNP-C

Priscilla Page, FNP-C

Sub-Investigator

Chris Romine, PA-C

Chris Romine, PA-C

Sub-Investigator

Jillian Sarles, PA-C

Jillian Sarles, PA-C

Sub-Investigator

Angela Kolter

Angela Kolter

FibroScan Technician

Nicole Pierce

Nicole Pierce

Assistant Clinical Research Manager

Tracy Knapp, BSN, RN

Tracy Knapp, BSN, RN

Clinical Research Coordinator

Arlen Waclawczyk

Arlen Waclawczyk

Clinical Research Coordinator

Lucero Peña

Lucero Peña

Clinical Research Coordinator