The Be Well MD medical team is comprised of clinicians who are uniquely qualified in caring for older adults, using the latest medical advancements combined with compassion and dedication to seniors.

Mark Carlson, MD

Dr. Carlson is a fellowship-trained, board-certified geriatrician, internist and oncologist with almost 30 years of healthcare experience. He received his medical doctorate from Loma Linda University in California and completed his geriatric medicine fellowship at the University of Hawaii in Honolulu.

Prior to his move into geriatrics, Dr. Carlson spent nearly 20 years of practice in medical oncology, where serious illness had to be managed with the latest in medical technology, compassion and a trusting patient-doctor relationship. Dr. Carlson combined this experience with his strong desire to help seniors in the aging process to create Be Well MD, an in-home medical service designed specifically for older adults.

Be Well MD incorporates the highest quality medical care and also ensures patients have consistent, convenient access to the care they need and desire. Dr. Carlson’s personal mission is to help seniors live healthier and happier lives.

Allen Sonstein, MD

Dr. Sonstein has vast experience in caring for older adults. He has a passion for it and it shows. As a board-certified internal medicine physician, Dr. Sonstein has dedicated his work to helping adults maintain healthy lifestyles and manage chronic conditions and supporting them through the aging process. Born and raised on the East Coast, Dr. Sonstein moved to Texas to practice in Waelder, Texas, a medically indigent area. He opened his Internal Medicine practice in Austin in 1978 where he practiced for 42 years. Throughout his career, he also served on the faculty of The University of Texas Medical Branch at Galveston and traveled on many medical mission trips to Central America. He currently serves on the volunteer faculty at the Dell Medical School where he spends time at the student-run clinic for the homeless.

Jason Spees, PhD, MAOM, APRN, L.Ac., FNP-C

Dr. Spees is a board-certified Family Nurse Practitioner, licensed acupuncturist, educator, and researcher. A graduate of the University of Texas School of Nursing, he earned his PhD in Nursing and has served as a clinical instructor for both undergraduate and graduate nursing students. Jason has been a trusted member of the Be Well MD family for more than seven years, providing clinical support, on-call services, and patient care while helping ensure continuity of care for concierge members across the practice. Known for his exceptional ability to connect with patients, Jason has extensive experience caring for older adults and understands the complex medical, emotional, and social needs that accompany aging. In addition to his clinical work, Jason is a nationally recognized educator and advocate who has authored human trafficking curricula, provides free healthcare services to trafficking survivors, and regularly speaks to healthcare professionals across the country. His professional mission is rooted in protecting vulnerable populations, promoting dignity, and delivering healthcare that is both evidence-based and deeply human.