Marion Pepper, Ph.D.

Marion Pepper, Ph.D.

Associate Professor, Immunology

Dr. Pepper graduated with a Bachelor's degree in Biology and English from Williams College and received her Ph.D. in Immunology in 2006 from the University of Pennsylvania.  She completed postdoctoral training at the University of Minnesota and joined the Department of Immunology as an Assistant Professor in 2011 and was promoted to Associate Professor 2017.

Contact Info

Department of Immunology
University of Washington  
Office E483, Box 358059
750 Republican Street
Seattle WA 98109-8059
Phone: 206-221-8261 or 206-221-5512
Fax: 206-616-4274

Research Areas

  • Adaptive Immune Responses


Link to Marion Pepper's Laboratory.


Marion Pepper

The adaptive immune system is characterized by specificity, functional diversity and memory. These characteristics engender the body with the ability to mount a directed response against an individual pathogen for many years after vaccination, but also allow for the propagation of long-lived allergic responses. In the Pepper lab, we study how cells of the adaptive immune system, called CD4+ T cells and B cells, form immunological memory by visualizing their differentiation, retention and function in both mice and humans. We accomplish this by using novel tetramer-based enrichment strategies to study small populations of antigen specific CD4+ T and B cells in both complex infectious diseases, such as malaria, as well as during allergic asthma using a house dust mite model. We additionally use transgenic mice with various genetic ablations to interrogate the underlying molecular mechanisms involved in memory cell development and function. The overarching goals of these studies are to both enhance immune memory to design better vaccines and inversely block the formation of immune memory to prevent allergic disease.

B.A., Williams College

Ph.D., Immunology, University of Pennsylvania


Graduate Student
Nicole Arroyo,

Laboratory Staff
Will Hahn, MD, Senior Fellow,
Whitney Harrington, Resident, SOM: Pediatrics: Infectious Disease: ACGME JM Resident/Fellow,
Brian Hondowicz, PhD, Research Scientist, 
Ismail Sebina, PhD, Senior Fellow,
Kennidy Takehara, Research Scientist Assistant, 
Karen Kim, Technician,