Valérie Y Hayes, PhD
Site Director
Dr. Valérie Hayes has been our clinic manager at our ENCORE Research Group’s Saint John’s location for over 2 years. She graduated from Mayo Clinic and worked in industry for 19 years. Her favorite part about working at St. Johns Center for Clinical Research is the external and internal community. “The community is wellness and vision driven, and the structure and culture of the organization is the best!” Dr.…
Sandra Hoogerwerf, MD
Gastroenterologist
Dr. Sandra Hoogerwerf is board certified in gastroenterology and internal medicine. Dr. Sandra Hoogerwerf has a deep understanding of digestive health issues, and functional bowel and motility disorders.
Danielle Marhanka, MPH
Research Assistant
Danielle Marhanka is a Research Assistants at our St. Augustine location and began her journey in clinical research in 2025. Danielle’s background includes serving as a Peace Corps volunteer from 2017-2019 after receiving her Bachelor’s degree from Emory University, and returning to Emory for her Master’s at the Rollins School of Public Health. Outside of research, Danielle’s passion is in maternal and child health, and volunteers her spare time as a Birth and Postpartum Doula in St.…
Ben Pineau, MD, FRCP
Medical Director
Dr. Pineau graduated magna cum laude and received his Doctor of Medicine from the University of Ottawa, Ottawa Ontario. He completed his gastroenterology residency in Canada. He then attended the University of Carolina in Charleston, South Carolina, where he completed his fellowship in advanced endoscopy at Wake Forest University School of Medicine in Winston-Salem, North Carolina.…
