With a M.D. background, David has worked in the field of Immunology since 2004. His postdoctoral studies at the National Institutes of Health in Bethesda, Maryland, focused on CD8+ T cell memory and Foxp3+ regulatory T cells. Later he worked as a research scientist at the human vaccine developing company, Sanofi Pasteur Vaxdesign in Orlando, Florida, where he studied mechanisms of vaccine side effects and maintenance of antibody-producing cells. He is the author of several peer-reviewed research papers in immunology. He initiated the development of the discovery framework dubbed SPIRAL at Tregeutix Inc, a a biotech startup that focuses on developing microbiota guided antigen specific immunotherapies.