Robert Siegel holds appointments in the Department of Microbiology and Immunology, the Program in Human Biology and the Center for African Studies. He is the course director for the infectious disease component of the preclinical currciulum at Stanford Medical School. Siegel has taught a number of classes related to the environment, as well as classes related to the impact of environmental factors on infectious disease. He also teaches classes focusing on the use of photography as a tool in studying the natural environment. He has lead ecotourism expeditions in locations such as Tanzania, Papua New Guinea and the Galápagos. He is also a docent at Año Nuevo State Park and Stanford’s Jasper Ridge.