The Center for Clinical Epidemiology and Population Health (CCEPH) is one of five research centers within the Marshfield Clinic Research Foundation and consists of 30+ staff with 8 PhD/MD investigators, 3 masters prepared epidemiologists, a research analytics team, and a research operations unit. Our research operations group includes research coordinators, telephone interviewers, and clerical support staff. Whether working with a single physician in rural Wisconsin or a large national research network, CCEPH has the research support services, experience, and expertise necessary to conduct consequential research on influenza, vaccines, chronic disease epidemiology, and health-care effectiveness.