Oak Cliff Health Center

Dr. Sinclair is a Graduate of Case Western Reserve University School of Medicine. He has practiced Infectious Disease Medicine and HIV Primary Care since finishing his Fellowship in Infectious Diseases at Case Western in July of 2000. He was a faculty member at The University of Texas Southwestern Medical Center at Dallas between 2000 and 2010 and achieved the rank of Associate Professor. In 2006, he took a year-long sabbatical to work at Merck and Co., Inc., where he was part of the team that prepared the New Drug Application which led to FDA approval of Isentress in 2007. He has served as the Director of Medical Education for the Texas Oklahoma AIDS Education and Training Center. He has been involved in the President’s Emergency Plan for AIDS Relief and participated in training events in Oshakati, Namibia, and in the Limpopo Province of South Africa. He currently practices HIV Medicine at Prism Health NTX in the southern sector of Dallas, Texas, and he holds privileges in Internal Medicine and Infectious Diseases at Baylor University Medical Center in Dallas. His clinical focus has always been expanding access to new treatment modalities in underserved communities, particularly for people with stigmatizing illnesses such as HIV, Hepatitis C, Sexually Transmitted Infections, and Tuberculosis.

Dr. Oregon McDiarmid is joining the Prism Health North Texas team at the South Dallas Clinic. Originally from England, he has spent years traveling around the United States and abroad while pursuing his education in medicine. He completed his undergraduate degree in Biomedical Sciences from Northern Arizona University and his Doctorate in Medicine from Trinity School of Medicine. He completed his residency training in Family Medicine from the University of Illinois Chicago. He practices full scope family medicine seeing patients of all ages, with strong passions in preventative medicine, chronic disease management, sexual health, HIV treatment and PrEP, and individualized health goals. Outside of work Dr. McDiarmid enjoys staying active playing on several sports teams including volleyball, dodgeball, kickball, and rugby.

Lori Morales, MD, is a Board-Certified Obstetrician/Gynecologist committed to delivering comprehensive and compassionate women’s health care. After graduating from Plano Senior High School, she attended Vanderbilt University and studied mathematics and premedical sciences. She returned to Texas for a doctorate in medicine at The University of Texas Southwestern Medical School and completed residency training in Obstetrics and Gynecology at The University of Texas Medical Branch at Galveston.

Dr. Morales’s accomplished career blends academic expertise, leadership experience, and patient-centered care across diverse clinical settings. As assistant professor at UT Southwestern Medical Center for ten years and recently as director of graduate medical education at Lone Star Circle of Care clinic, she has been dedicated to training early-career physicians. She also served as medical director of the Parkland Hospital Ob/Gyn Emergency Department, focusing on patient safety, quality improvement, and access to care. Her practice experience includes providing direct patient care in clinics affiliated with Medical City Plano, Methodist Dallas Medical Center, Parkland Health System, and Lone Star Circle of Care.

Dr. Morales resides in Dallas with her husband, two daughters, and their miniature poodle. Outside of her medical practice, she enjoys staying active, attending live music and sporting events, and spending time with friends and family.

Jennifer Klein is a Family Nurse Practitioner in Dallas who has provided primary and specialized care for people living with HIV since 2005. Her professional experience prior to working in HIV includes public education, community health, and specifically health promotion. Jennifer was fortunate enough to stumble into her career with Prism Health North Texas while fulfilling her commitment to working in an underserved clinic through National Health Service Corps. She completed her Master of Science in Nursing at Johns Hopkins University School of Nursing in 2004. Jennifer maintains credentialing as an AAHIVM Specialist, acts as a sub-investigator on multiple clinical trials, and currently sees patients full-time.