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Prior to assuming the role of Health Officer for Public Health — Seattle & King County in June 2015, Jeff served for over 15 years as Chief of the Public Health's Communicable Disease Epidemiology & Immunization Section. Jeff trained as a Medical Epidemiologist in the Centers for Disease Control and Prevention's (CDC) Epidemic Intelligence Service (EIS) after which he completed the CDC's Preventive Medicine Residency program. He worked for the CDC in the National Center for Infectious Diseases, the Division of Tuberculosis Elimination, and the Division of HIV/AIDS Prevention before joining Public Health – Seattle & King County. Jeff did his internal medicine training at Thomas Jefferson University Hospital in Philadelphia, completed a fellowship in general internal medicine and emergency medicine at the Hospital of the University of Pennsylvania and did his infectious disease subspecialty training at the University of Washington.

Jeff has served in numerous local and national leadership positions, including as a member of the CDC's Board of Scientific Counselors and the Advisory Committee on Immunization Practices (ACIP), the National Academy of Medicine's (NAM) Forum on Microbial Threats, and the NAMs Forum on Medical and Public Health Preparedness, and the National Quality Forum's Adult Immunization Committee.

Jeff has served as Chair of the Public Health Committee and of the Bio-emergencies Task Force for the Infectious Disease Society of America, and was a member of the US Department of Health and Human Services "Tiger Team" providing in-country consultation with the Government of Greece on public health preparations for the 2004 Olympics.  He served as a member of the Editorial Board and Technical Workgroup on Communicable Disease Alert and Response for Mass Gatherings for the World Health Organization, Geneva, Switzerland and is a member of the Virtual International Advisory Group, World Health Organization, Geneva, Switzerland.

Jeff is a Fellow of the American College of Physicians and the Infectious Disease Society of America and holds appointments as Professor of Medicine, Division of Infectious Diseases and Adjunct Professor in the School of Public Health at the University of Washington. Jeff's peer review publications and research interests focus on communicable diseases of public health significance.

Jeff also co-chairs the King County Heroin and Opiate Addition Task Force formed to confront the region's growing heroin and opioid epidemic.

Outside of work, Jeff is the married parent of two young adults, and an avid bicyclist.