Dual-specialized in preventive medicine and internal medicine, Tracy Mark J MD practices at Point Loma's Health Services Complex within San Diego County's Tuberculosis Control and Refugee Health program on Rosecrans St. The TB Control clinic shares the Rosecrans complex with the San Diego Immunization Coalition, linking tuberculosis case management to the county's broader vaccine-coordination infrastructure. A University of Wisconsin School of Medicine graduate (class of 1978) with UCLA-VA Greater Los Angeles internal medicine residency training, Tracy brings over four decades of clinical experience to TB skin testing, QuantiFERON blood draws, chest X-ray interpretation, and directly-observed therapy. Specimen processing for culture confirmation and drug-susceptibility panels routes through public health and regional laboratories such as Sharp Laboratory Services Point Loma. The program's most complex caseload involves managing multi-drug-resistant tuberculosis in binational patients requiring extended treatment regimens coordinated across the San Diego–Tijuana border corridor.