A Granbury Institution — Independent, Trusted, and Here for You
Acton Medical Clinic has been an independently owned and operated family medicine practice in Granbury, Texas since 1997. We are not a corporate health system or a revolving door of providers — we are your neighbors, your community, and your long-term healthcare partners.
Our goal has always been straightforward: deliver high-quality, compassionate healthcare to every patient who walks through our doors. Over the decades, we have continuously expanded our services and capabilities to meet the evolving needs of our community — from pediatric and geriatric care to women’s health and the latest in intimate wellness treatments.
We believe that great healthcare is built on relationships. When you choose Acton Medical Clinic, you’re choosing a team that knows your name, your history, and your goals — and is genuinely invested in helping you achieve them.
Jean Pierre Letellier, MD
Born and raised in New York City, Dr. Letellier earned his medical degree from the University of New Mexico in 2004 and completed his residency in Family Medicine at Texas Tech University in Lubbock. He practiced in Seminole, TX for 12 years before bringing his expertise to Granbury in 2019.
Board Certified in Family Medicine, Dr. Letellier is fluent in both English and Spanish — an invaluable asset for our bilingual patients. Outside of medicine, he enjoys golf, poker, music, running, horse racing, and spending time with his wife Theresa and their two daughters.
David Blocker, MD, MPH
Dr. Blocker is a Preventive Medicine physician with over 25 years of patient care experience, including 21 years as a flight surgeon in the US Air Force. After retiring to Granbury in 2018, he served as Hood County’s Public Health Authority during the COVID-19 pandemic.
Dr. Blocker is the only physician in Hood County authorized to perform FAA medical exams for commercial and private pilots — exclusively at Acton Medical Clinic. He also serves as Medical Director of the LGMC Wound Care Center. Se habla Español.
Summer Cumba, PA-C
Summer has served the Granbury community for over 18 years as a Physician Assistant, with 12 of those years at Acton Medical Clinic. She earned her Master of Physician Assistant Studies from Texas Tech Health Sciences Center in 2002. Summer sees a broad range of conditions including acute care, general physicals, and chronic disease management. A proud Granbury local, she’s active in Lakeside Baptist, youth sports, and the school community.
Lyndi Armstrong, APRN, FNP-C
Lyndi brings six years of Emergency Room nursing experience to her role as a Family Nurse Practitioner. A true Acton local, she lives in the community with her husband Logan, their two children Nixon and Salem, and an ever-growing farm that includes a dog, three goats, and around 40 chickens. When she’s not caring for patients, she’s working on projects around their property and spending time with family.
Richard Neckar, APRN, FNP-BC
Richard earned his BS in Nursing from Tarleton State University in 1998 and his MSN as a Family Nurse Practitioner from UT Arlington in 2008. A Hood County resident since 2001, he served as an Officer and Trauma Nurse in both the US Army and Navy. Richard practices full-time in Emergency Medicine alongside his role at Acton Medical. His interests include travel, blockchain technology, sports, and cooking.