Meet Our Team
Harry L. Uy, MD, FACE
Endocrinologist
Dr. Harry Uy is a respected endocrinologist with a medical degree from the University of the Philippines’ College of Medicine and a specialized fellowship at the University of Texas Health Science Center, focusing on bone biology. He excels in treating thyroid disorders and osteoporosis and is committed to education, mentoring medical students and residents. Recognized as one of San Antonio’s Best Doctors and a Texas Super Doctor, he enjoys family life and hobbies like golf, swimming, traveling, and photography.
Patricia L. Rosillo, MD
Rheumatologist
Dr. Patricia Rosillo is a board-certified internal medicine physician and rheumatologist specializing in pediatric rheumatology. She completed her medical degree at the University of Texas Health Science Center at Houston and her specialty training at Baylor College of Medicine. Dr. Rosillo has a keen interest in autoimmune diseases, congenital connective tissue disorders, and geriatric care. Outside of medicine, she enjoys baking and has recently taken up raising chickens and farm fowl.
Petra Grinnell, MSN, APRN, FNP-BC
Family Nurse Practitioner
Petra Grinnell, originally from Germany, moved to the U.S. in 1981. She earned her nursing degrees from Bay de Noc Community College and Lake Superior State College, and after serving in the Army Nurse Corps, she settled in San Antonio, Texas. With over 15 years in diabetes management, she completed her Master’s Degree in Nursing in 2010, specializing as a Family Nurse Practitioner. Petra is dedicated to holistic care and serves as a clinical preceptor for nursing students. In her spare time, she enjoys reading, cooking, gardening, and spending time with her dogs.
Joseph Borrego, RT (N) (ARRT)
Nuclear Medicine Technologist
Joseph Borrego is a Nuclear Medicine Technologist with a passion for health and wellness. A San Antonio, Texas native, he has been part of the Endocrinology Nuclear Medicine Associates team since May 1997. As a family man with a wife and two daughters, Joseph enjoys reading, exercising, and cheering for the San Antonio Spurs. He advocates for a balanced lifestyle and genuinely cares about his patients’ well-being, supporting them in their health journeys through his expertise in nuclear medicine and commitment to fitness and nutrition.