The Department of Medicine is pleased to announce the promotion of Alexandra Guillaume, M.D., Division of Gastroenterology and Hepatology to Clinical Associate Professor of Medicine in the Renaissance School of Medicine at the State University of New York at Stony Brook.
Dr. Guillaume graduated from Tufts University School of Medicine. She completed Internal Medicine residency at New York University Medical Center, a Nutrition Fellowship at Columbia University Medical Center and her GI Fellowship at Stony Brook University Hospital.
Dr. Guillaume's clinical expertise is in the management of functional and motility disorders. She is the Medical Director of the Gastrointestinal Motility Center at Stony Brook, which specializes in the comprehensive evaluation of luminal motility disorders. Under the leadership of Dr. Guillaume, the Motility Center provides the latest in innovation and technology to diagnose and treat a wide breadth of GI motility disorders and is the only full-service center in Suffolk County, Long Island. 
Dr. Guillaume has been recognized as a NY Super Doctor 2025 in the specialty of Gastroenterology and is heavily engaged in scholarly work and invested in contributing scientifically to her field. She has given presentations to her peers regionally, nationally, and internationally and has published in peer-reviewed journals including Nature Reviews Gastroenterology and Hepatology, Clinical and Translation Gastroenterology, and Frontiers in Gastroenterology. She has contributed pieces to the Long Island Press and 1010 WINS.
Dr. Guillaume is also a funded research scientist, with an RO3 award from the National Institute of Health to pursue basic science research titled "Disentangling the Effect of Black/African Ancestry from Confounding Variables on Colorectal Cancer Biology."
Dr. Guillaume is co-founder and Board Member of the Association of Black Gastroenterologists and Hepatologists, ABGH, a non-profit organization founded in 2021 for the purpose of addressing health care disparities in gastrointestinal and liver diseases disproportionately affecting Black communities. ABGH has been recognized nationally for its health equity and advocacy work. She co-directs ABGH’s annual NEXUS Conference (Nurturing, EXcelling and Unifying Sisters in Medicine), a conference that dives deep into the challenges faced by Black women in the medical field to emerge with practical solutions, unwavering support, and community.
Please join us in congratulating Dr. Guillaume on this well-earned promotion, and in recognizing her excellence as a clinician, leader, and educator within the Department of Medicine and the Renaissance School of Medicine at Stony Brook University.