Baxter Health announced the addition of Dr. William Spencer Grigg, DO, MBA, to the Baxter Health Cardiovascular Clinic.
Dr. Grigg is an electrophysiologist, a physician who specializes in diagnosing and treating abnormal heart rhythms, and his arrival marks the beginning of a dedicated cardiac electrophysiology program for Mountain Home and the surrounding region.
The electrophysiology program treats conditions like atrial fibrillation, which causes an irregular and often rapid heartbeat, or other arrhythmias that affect how the heart beats, can significantly impact quality of life and if left
unmanaged, can raise the risk of stroke or heart failure.
Having a specialist with Grigg’s training and experience in Mountain Home means that patients who once had to travel hours for this level of care can now get it close to home.
“This is a milestone for Baxter Health and for our region,” Ron Peterson, President and CEO of Baxter Health, said. “Bringing a dedicated electrophysiology program to Mountain Home means our patients no longer have to leave home to access this level of heart rhythm care. Grigg is not just an exceptional physician, he is someone who chose to be here, who wants to be part of this community. That matters to us, and it will certainly matter to our patients.”
Grigg completed his residency training in internal medicine and then went on to complete fellowship training in general cardiology, both through UCHealth and the University of Colorado.
In June 2026, he completed an advanced fellowship in cardiac electrophysiology at the University of Rochester Medical Center, one of the country’s leading academic health systems.
In practice, Grigg is trained to perform catheter ablation procedures, a minimally invasive technique used to correct abnormal electrical pathways in the heart that cause irregular rhythms. He is also experienced in implanting pacemakers and defibrillators, devices that help the heart maintain a safe and steady beat.
For patients with atrial fibrillation who cannot tolerate blood thinners long-term, he is trained in Watchman-type procedures, which can reduce stroke risk through an alternative approach. He brings experience with the latest ablation technologies, including methods that are more precise and often associated with faster recovery.
Grigg describes his approach to patient care simply, listen closely, explain things clearly and treat patients the way he would want his own family treated. He believes patients deserve to understand their diagnosis and know their options, and he is committed to working alongside patients, their families and referring physicians to build treatment plans that make sense for real people living real lives.
Originally from Hickory, North Carolina, Grigg and his family look forward to putting down roots in Mountain Home. Outside of the clinic, he enjoys spending time with his wife and children, volunteering, traveling, skiing, mountain biking and hiking.
Grigg joins an experienced cardiovascular team that includes Timothy Bowen, MD, Michael Camp, MD, Akihiro Kobayashi, MD, Jamon Pruitt, MD, Ernesto Ruiz-Rodriguez, MD, Patrick Tobbia, MD, Otis Warr IV, MD, Denise Beeson, APRN, Leah Fountain, APRN, and Debra Wilhite, APRN.
Grigg will begin seeing patients in late August. Appointments are available now through the Baxter
Health Cardiovascular Clinic. To schedule, please call (870) 425-8288.
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