Southern California native, Lisa Maehara, DO, has served patients as a physician since 2019. Dr. Maehara completed her undergraduate degree from the University of Notre Dame. She earned her medical degree from A.T. Still University- Kirksville College of Osteopathic Medicine in Missouri, and completed her residency training at McLaren Macomb Hospital in Michigan. Certified by the American Board of Family Medicine, ...

Meagan Scott, B.S., M.S., Hearing Instrument Specialist Meagan Scott is a graduate of the University of Texas at Dallas, where she obtained her bachelor’s degree in Speech-Language Pathology and Audiology. Her studies at the prestigious Callier Center has afforded her the expertise to connect with patients and provide research-based analysis of communication disorders. Mrs. Scott also holds a Master of Science in ...

Barbara Kallenbach-Watson received her bachelor’s and master’s degree in nursing from Wayne State University in Detroit, Michigan. She is certified as an Adult Nurse Practitioner through the American Nurses Credentialing Center. Barbara has a special interest in women’s health care and teaching patients self-care measures to improve their health and quality of life. Barbara enjoys being active and spending time with ...

Charles Lostak, DO, is a veteran gastroenterologist who has been on the medical staff of Methodist Health System since 1992. He earned his bachelor’s degree in chemical engineering at the University of Colorado Boulder. He went to work as a petroleum engineer for several years before entering medical school. Dr. Lostak received his Doctorate of Osteopathic Medicine from Oklahoma State University Health Sciences ...

Heather Havener, MD, always had an interest in women's health and decided on her specialty because it allowed her to combine medicine and surgery. After medical school, she served in the U.S. Navy Medical Corps as a Naval Medical Officer and physician, and she moved to the DFW Metroplex in 2013. Today, she focuses specifically on gynecological care, from wellness visits to minimally invasive surgery. She is ...

Steve Duffy, MD, FACS, is a board certified general surgeon. He is a full-scope surgeon, but has a particular interest in advanced hernia repair and abdominal wall reconstruction, colorectal, gastrointestinal surgery and removal of skin and soft tissue lesions. Dr. Duffy earned his Bachelor’s and Master’s degrees from the University of Texas at Dallas in Richardson, Texas. He then received his medical degree from the ...

J. Trever Rester, MD, is an experienced primary care physician who has been serving the greater Lake Ray Hubbard area since 1998. Dr. Rester graduated medical school from the University of Texas Health Science Center at Houston, McGovern Medical School, and completed his residency in both internal medicine and pediatrics from the University of Tennessee College of Medicine in Memphis, TN. Certified by both the ...

Leo Robb, DO, is a board-certified family medicine physician at Methodist Family Health Center — Colleyville. He treats adolescents and adults, with a focus on routine care and chronic conditions such as high blood pressure and diabetes. Dr. Robb has more than 30 years of experience in family medicine, practicing in Exton, PA, and Boynton Beach, FL, before joining Methodist in 2025. His interest in medicine began ...

William Fleischer, MD, is a board certified vascular surgeon with focus on the surgical and endovascular treatment of complex aortic disease including aneurysm and dissection. Dr. Fleischer specializes in the treatment of carotid disease, peripheral arterial disease, dialysis access, venous insufficiency, and varicose veins. Dr. Fleischer earned his medical degree from the University of Texas Health Science Center, ...