Our clinicians provide state-of-the-art, caring treatment for patients with endocrine and metabolic disorders. Our faculty are experienced, highly trained physicians who are leaders in their fields, providing expert consultation and care in the full range of endocrine practice. For more information, visit our healthcare site.

Appointment Information

All clinics are staffed by Baylor faculty endocrinologists, assisted by endocrine subspecialty fellows.

  • For Baylor Clinic, call (713) 798-4736 for an appointment.
  • For Baylor St. Luke's Medical Center consults, call (713) 605-8989, pager #28702.
  • For clinics at Ben Taub Hospital, call voice mail (713) 569-9927 for appointments.
  • For veterans only, call (713) 791-1414.

Clinical Research Studies

Faculty members of the Section of Endocrinology, Diabetes and Metabolism have numerous ongoing clinical research projects in the areas of diabetes, obesity, bone disease, male reproductive disorders and hormonal replacement, thyroid cancer and HIV-related metabolic diseases. If you would be interested in participating in such studies, please call the endocrine division office: (713) 798-1707.

Meet our Healthcare Team

Clinical activities occur in the three clinical pavilions affiliated with Baylor: Ben Taub Hospital/Smith Clinic, Baylor St. Luke’s Medical Center/Baylor St. Luke’s outpatient clinic, and the Michael E. DeBakey VA Medical Center. Clinical faculty have a broad number of interests that cover the entire spectrum of clinical endocrinology, diabetes and metabolism.   

Dr. Ha Nguyen

Dr. Nguyen is the most recent recruit in the section. She graduated valedictorian from the University of Hanoi Medical School and completed a residency at Einstein Medical Center/Philadelphia and a clinical fellowship in general endocrinology at the University of Pittsburgh Medical Center, followed by a second fellowship in endocrine neoplasia at the University of Texas MD Anderson Cancer Center. Besides specializing in the treatment of patients affected by endocrine neoplasia and endocrine complications of cancer treatment, she also is an expert in recognizing and managing endocrine complications caused by checkpoint inhibitors. 

Dr. Dennis Villareal

Dr. Dennis Villareal is a physician-scientist with specialty training in endocrinology and geriatrics (completed at Washington University School of Medicine and St. Louis University School of Medicine, respectively) who is interested in managing geriatric patients affected by a number of endocrine conditions, including obesity, sarcopenia, osteoporosis and hypogonadism. His practice is at the Michael E. DeBakey VA Medical Center.

Dr. Sanjay Mediwala

Dr. Mediwala is a master clinician and associate program director of the Baylor Endocrine Fellowship Program. He graduated from Baylor College of Medicine, where he also completed a residency in internal medicine and a fellowship in endocrinology. His practice is at the Michael E. DeBakey VA Medical Center, where he sees patients affected by diabetes, osteoporosis, adrenal, testicular and thyroid disorders in his general endocrine clinic. He also sees patients with thyroid, parathyroid and adrenal neoplasia in a joint clinic with general surgery, and remote veterans with diabetes in a video telehealth clinic. He attends on the inpatient general medicine service as well as the endocrine consult service, and greatly enjoys teaching at the medical student, resident and fellowship levels.

Dr. Nalini Ram

Dr. Ram serves as a clinical educator, clinician, academic administrator and clinical researcher and is the chief of endocrine services at Ben Taub Hospital.  She graduated from Kilpauk Medical College, Madras University, Tamil Nadu, India. Dr. Ram completed a residency in internal medicine and fellowship in endocrinology at Henry Ford Hospital in Detroit, Michigan. In recognition for her commitment to the College’s mission in education, she was awarded the Fulbright and Jaworski Faculty Excellence Award in the “Teaching” category in 2010, membership to the Baylor Academy of Distinguished Educators since 2010, and the Norton Rose Fulbright Faculty Excellence Award in the “Teaching and Evaluation” category in 2018. In recognition of her outstanding clinical qualities she also received the BCM “Rising Star Clinician” Award in 2015. She is responsible for the clinical education of fellows and residents on the Endocrine consult service at Ben Taub General Hospital for ~4 months/year. She directs the OB-Endocrine, Ultrasound-guided thyroid fine-needle aspiration, General Endocrine and the Diabetic ketoacidosis clinics.

Dr. Massimo Pietropaolo

Dr. Pietropaolo is a professor and McNair Scholar in the Section of Endocrinology. He is an MD graduate from the University of Perugia (Italy) Medical School. He completed his internal medicine and endocrinology training at the University of Perugia and a type 1 diabetes research training at the Joslin Diabetes Center, Harvard Medical School. His specialties are type 1 and 2 diabetes, and he sees patients at the Baylor St. Luke's outpatient clinic and Ben Taub Hospital.   

Dr. Ruchi Gaba

Dr. Gaba is the front-person for thyroid-related disease in the Section of Endocrinology, Diabetes and Metabolism. She completed her medical school from the University College of Medical Sciences (India), followed by a residency in internal medicine at the University of Alabama and fellowship in endocrinology at Baylor College of Medicine. She is one of two Baylor physicians specialized in performing fine needle aspirates of thyroid nodules and offers her services both at the Baylor St. Luke's clinic and the Harris Health Smith Clinic, where she teaches the procedure to trainees. She leads weekly educational activities such as the inter-disciplinary Thyroid Cancer Tumor Board meeting. Moreover, she delivers in- and out-patient general endocrine care and has been instrumental for the creation of a number of specialized clinical and research activities, including a unique Ketosis-Prone Diabetes (KPD) program and a first-of-its-kind multidisciplinary Fatty Liver Clinic in collaboration with the gastroenterology service, where she provides evidence-based individualized care on metabolic aspects of these patients. 

Dr. Susan Samson

Dr. Samson is a master clinician and educator. She graduated from Queen’s University (Kingston, Canada) and completed her internal medicine residency at the University of Calgary and her endocrinology fellowship at Baylor College of Medicine. She is the Medical Director of the Baylor St. Luke’s Pituitary Center, which is a multi-state referral center for patients with pituitary tumors and disorders. She also serves Harris Health System as a staff endocrinologist for outpatient clinics and the Ben Taub Hospital inpatient service.

Dr. Reina Villareal

Dr. Villareal is physician-scientist studying the genetic determinants of gonadal steroid metabolism and bone biology. She is an MD graduate from the Cebu Institute of Medicine in the Philippines. Dr. Villareal completed her Internal Medicine residency at Texas Tech University Health Sciences Center in Amarillo, Texas, and fellowship in Endocrinology at Washington University in St. Louis, Missouri, where she ran the Bone Health Program as Medical Director. She is board-certified in endocrinology. While maintaining a strong and successful research focus, she is also a very active clinician at the Michael E. DeBakey VA Medical Center, where she has outpatient clinics focused on osteoporosis and general endocrinology.  

Dr. Madhuri Vasudevan

Dr. Vasudevan has been a faculty in the Baylor Section of Endocrinology, Diabetes and Metabolism at the Michael E. DeBakey VA Medical Center (MEDVAMC) since 2012.  She is an MD graduate from the University of Texas HSC Houston. She completed a residency in internal medicine and a fellowship in endocrinology at Baylor and is certified in Medicine and Endocrinology. She led the task force that created the first electronic consultation service provided by MEDVAMC and helped pioneer the way for other medical and surgical subspecialties to follow. She is the supervising endocrinologist for the growing diabetes insulin pump and sensor program at MEDVAMC and has participated in regional and national leadership committees to create guidelines for the use of diabetes technology and therapeutics. She shares all clinical responsibilities, including inpatient medicine, inpatient endocrinology consultation, and outpatient endocrinology clinical care services. Dr. Vasudevan has been recognized for her professional achievements with the Norton Rose Fulbright Award for Excellence in Teaching and Evaluation and STAR award. 

Dr. Rui Chen

Dr. Chen is an MD graduate from Indiana University School of Medicine. He completed his medicine residency and endocrinology fellowship at Baylor College of Medicine. He sees outpatients at the Michael E. DeBakey Veterans Administration Medical Center (MEDVAMC) and the Baylor St. Luke's outpatient Clinic. He does inpatient rounds during selected months at the MEDVAMC.  His clinical and research interests include metabolic bone disease, non-invasive fracture risk assessment, sarcopenia, and the role of circadian rhythm in metabolic disorders. 

Dr. Bryan Jiang

Dr. Jiang is an MD graduate from Baylor College of Medicine. He completed a residency in internal medicine and fellowship in endocrinology also at BCM. He serves at the Harris Health System as a staff endocrinologist for outpatient clinics and the Ben Taub Hospital inpatient endocrinology service. He also has a weekly clinic at the Baylor St. Luke's outpatient clinic under the umbrella of the Dan L Duncan Comprehensive Cancer Center, where he sees patients affected by cancer-related endocrine complications. Dr. Jiang is an expert in quality improvement and leads a number of QI projects originating from the section. His personal interest is in metabolic bone diseases.

Dr. Marco Marcelli

Dr. Marcelli is the current interim chief of the Section of Endocrinology, Diabetes and Metabolism and chief of Endocrine Services at the Michael E. DeBakey VA Medical Center (MEDVAMC). He is board certified in endocrinology and is an MD graduate from the University of Perugia (Italy) Medical School. He completed a residency in internal medicine at the University of Perugia affiliated hospitals and a clinical fellowship in endocrinology at the University of Texas Southwestern Medical School in Dallas, Texas. He is an expert on male reproductive disorders and a general endocrinologist with a large practice of men affected by various forms of hypogonadism, reproductive disorders and general endocrinology at MEDVAMC.

Dr. Mandeep Bajaj

Dr. Bajaj is a graduate from the All India Institute in New Delhi, India. He is Vice Chair for clinical affairs of the department of medicine.  He completed his endocrinology fellowship at the Joslin Clinic. He is interested in diabetes and sees his patients at the Baylor St. Luke's Medical Center outpatient clinic, where he is the chief of Endocrine Services.     

Dr. Rajagopal Sekhar

Dr. Sekhar is a physician-scientist who is board certified in medicine and endocrinology. He has an MD degree from St. John’s Medical College in India. He completed a residency in internal medicine at the University of Oklahoma and a clinical fellowship in endocrinology at Baylor College of Medicine. He is an expert in nutrient metabolism and mitochondrial energetics. He sees patients at the general outpatient clinics of Ben Taub Hospital and at the St. Thomas Street Clinic. 

Dr. Ashok Balasubramanyam

Dr. Balasubramanyam is a former director of Baylor’s Endocrine Fellowship Training Program, past President of the Association of Program Directors in Endocrinology and Metabolism, and current Director of Baylor’s Clinical Scientist Training Program. He is an MD graduate from St. John’s Medical College in India. He completed his residency in internal medicine at Baylor College of Medicine and a fellowship in endocrinology at Massachusetts General Hospital, Harvard Medical School and is board certified in endocrinology. He specializes in Diabetes and sees diabetic and general endocrinology patients at Ben Taub Hospital. 

Dr. Siripoom McKay

Dr. McKay completed her MD, internal medicine and endocrinology training at  Baylor College of Medicine. She has been the Baylor site PI for the NIH-funded RCT TODAY (Treatment Options for Type 2 Diabetes in Adolescents and Youth) since 2002. She is the medical director for the Young Adult Transition Program at the Baylor St. Luke's Medical Center. This program provides a friendly, structured multidisciplinary transition plan that is individualized for each family. Dr. McKay is on the steering committee of the Pediatric Device Consortium, an FDA-funded program that includes physicians and engineers from Baylor, Rice, Texas A&M, and other institutions whose goal is to use data gathered from diabetes devices (such as continuous glucose monitors and insulin pumps) to improve the care and quality of life for patients with diabetes. Dr. McKay also has a longstanding interest in improving the quality of medical care at Baylor. She leads the Inpatient Diabetes Quality Improvement team at Texas Children's Hospital.

Dr. Jasmine Boparai

Dr. Boparai is an MD graduate from the University of Bombay, India. She completed her residency and fellowship in endocrinology at Baylor College of Medicine. She is a general endocrinologist who sees patients at the McNair campus of Baylor St. Luke's Medical Center and specializes in the care of patients with type 2 diabetes, adrenal nodules, hyperthyroidism and hypothyroidism, as well as in-hospital care.