Project Summary/Abstract The purpose of this renewal application is for funding of the existing University of Pennsylvania (UPENN) Occupational & Environmental Medicine (OEM) Residency. The program, in existence since 1997, designed to train up-to eight first-year trainees (OM-1) and six second-year trainees (OM-2) annually. Trainees are practicing physicians making a mid-career change to the specialty of OEM and admitted to the External Track (ET) as well as recent medical school graduates who are eligible for admittance to the Internal Track (IT). The ET, train-in-place track, helps overcome barriers that deter otherwise motivated physicians from specialist training. ET residents work full-time as OEM physicians at an approved clinical training site (CTS) supervised by an American Board of Preventive Medicine (ABPM) certified physician. IT residents, more recent medical school graduates, rotate at the UPENN and affiliated organizations such as the Philadelphia Veterans’ Administration Hospital, as well as governmental agencies and industry. The overall purpose is to graduate 30 trainees over the 5- year grant period, including 10 NIOSH supported. The specific measurable objectives are to help increase the nation’s primary care workforce, increase diversity in health professions programs and the health workforce across the country, develop our residents to be teachers of prevention and equip them to work with medically underserved populations. We work towards continuous improvement of the training curricula to iteratively meet the needs of our residents and of the workforce. Qualified applicants have completed at least 1 clinical year and have a Master of Public Health or equivalent degree, or a plan for completing the degree before graduation, in keeping with American Council of Graduate Medical Education (ACGME) requirements. The program provides 2 interrelated components: the applied clinical component at the CTS and a didactic component that requires monthly 3-day sessions at UPENN: 12 didactic sessions during the first year and 5 during the second year. Both components work in tandem to allow acquisition of the ACGME and allows trainees eligibility for the ABPM- Occupational Medicine examination. As the largest civilian OEM residency in the US, with an average of 7 residents each academic year, we currently have 8 residents in training. As of June 2023, we have 165 alumni/graduates. Graduates pursue careers in the advanced clinical and administrative practice of OEM. Generally, over 90% of our trainees remain in the field of OEM.