Thomas Wallach

Dr. Thomas Wallach serves as Assistant Professor, Research Director, Chief of Pediatric Gastroenterology, and Fellowship Director of Pediatric Gastroenterology at SUNY Downstate Medical Center's College of Medicine, Department of Pediatrics. He leads a translational research laboratory focused on pediatric gastrointestinal disorders while maintaining active clinical practice at University Hospital at Downstate.

His educational foundation includes:

• Undergraduate: Pomona College
• Medical School: Medical College of Wisconsin
• Residency: Columbia University
• Fellowship: University of California San Francisco

Dr. Wallach's research centers on intestinal epithelial barrier homeostasis, environmental enteropathy, and health disparities in pediatric populations. He pioneers the application of RNA sequencing (bulk and single-cell), machine learning, and epidemiological approaches to investigate persistent SARS-CoV-2 infection (SPIES), fecal biomarkers like mitochondrial DNA, and gut-brain axis disorders. Clinically, he specializes in gastrointestinal pain disorders, early childhood nutrition, and inflammatory diseases, with particular emphasis on addressing underrepresentation of minoritized groups in medicine and research.

Analysis of his recent publications reveals a cohesive research trajectory examining inflammatory bowel disease, eosinophilic esophagitis, and SARS-CoV-2 sequelae through interdisciplinary lenses. His work consistently integrates molecular diagnostics with health equity frameworks, demonstrating how computational resources can expose and alleviate health disparities. Key methodological innovations include LLM/ML screening tools and novel biomarker applications for underserved populations.

As Fellowship Director, Dr. Wallach mentors the next generation of pediatric gastroenterologists while leading collaborative research teams investigating the intersection of environment, health, and disparities. His laboratory employs advanced genomic and computational techniques to address critical gaps in pediatric gastrointestinal pathophysiology and therapeutic development.