Joshua Schiffer, MD, MS

Associate Member


Josh is an Associate Member in the Vaccine and Infectious Disease Division at Fred Hutchinson Cancer Research Center and Assistant Professor at the University of Washington in the Division of Allergy and Infectious Diseases, Department of Medicine. 

Josh loves identifying problems in the clinic and the infectious diseases literature that can be addressed with mathematical models.  He feels privileged to collaborate with such a driven and gifted group of multi-disciplinary scientists and clinicians at Fred Hutchinson and the University of Washington. 

A proud native of Baltimore, Josh is now fully acclimated to the Pacific Northwest.  In his spare time, he enjoys eating, reading, hiking, skiing, downwind paddle boarding and spending time with his two sons and wife.


David Swan, MS, MME

Systems Analyst/Programmer


David joined the Schiffer Group in 2010 as an independent software consultant.  He works with several groups at Fred Hutchinson providing simulation expertise and other types of computing support. 

Prior to working at Fred Hutchinson, David was a senior software engineer with F5 Networks and Boeing as well as serving as high school teacher with the Peace Corps in Kenya, East Africa.  He has an undergraduate degree in Electrical Engineering from Stanford and graduate degrees in Computer Science and Medical Engineering from UW.

When not at work, he enjoys spending time with his family, playing ultimate frisbee, stone carving and delving into all the outdoor activities the Northwest has to offer.



Bryan Mayer, PhD

Staff Scientist


Pavitra Roychoudhury, PhD

Post-Doctoral Research Fellow


Pavitra is a Postdoctoral Research Associate with the Schiffer Group. She recently completed her PhD in Bioinformatics and Computational Biology at the University of Idaho where she studied the effects of spatial structure on phenotypic  evolution in bacteriophages.

Pavitra enjoys working on problems that lie at the interface of biology, mathematics and engineering and is excited to be a part of the dynamic and interdisciplinary environment at the Hutch.

She was born in Bangalore, India but spent most of her childhood in Nigeria and Ghana and spent 9 years in Singapore before coming to the States. She enjoys traveling, photography, swimming, music, dance and the wonderful outdoors of the Pacific Northwest.




Elizabeth Duke, MD

Infectious Disease Fellow


Elizabeth joined the group in the summer of 2015. She studied math and Latin at Marshall University in West Virginia as an undergraduate, math as a master's student, and medicine at Marshall's School of Medicine. She completed a residency in Internal Medicine at the University of Wisconsin (UW) and came to the Pacific Northwest as an Infectious Disease fellow at the University of Washington (UW). She is trying to remember the math she learned 10 years ago in order to gain insights into clinical and basic science problems in Infectious Diseases. She is currently working on projects that include intra-host models of HIV latency, CMV, and HSV. 

Elizabeth enjoys watching the Green Bay Packers and secondly the Seattle Seahawks, exploring the West Coast, soaking in hot tubs, singing in the car, watching movies (good ones, mainly), fancy computers, llamas and alpacas, and music of the 1980's.



Laura Matrajt Arbetman, PhD

Research Associate


Daniel Reeves, PhD

Post-Doctoral Research Fellow



Dan is a postdoctoral fellow with the Schiffer group who got his PhD in physics from Dartmouth College. Dan has studied physics for his entire education but has always been inspired by biological problems. The complex systems perspective is what drew him to theoretically immunology originally and he is excited to begin working on a project studying the dynamics of HIV and the different outcomes that arise from different candidate therapies.

Outside of thinking about science and mathematics problems, Dan enjoys crossword puzzles, writing music, rock climbing and adventuring around the world with his wife.


Jun Sellers

Research Program Coordinator


Jun is a Research Program Coordinator for Josh Schiffer and is a member of the IRB regulatory team in the Infectious Disease Sciences program.

She holds a BA in English Literature and a Certificate in Editing from the University of Washington. She grew up in the windsurfing town of Hood River, Oregon, and enjoys rock climbing, skiing, tennis, reading, and traveling - her most recent destination was Myanmar with her husband and 6-year-old son.