A Doctor of Nursing Practice and board-certified adult-gerontology acute care nurse practitioner, Michaela Johnson provides comprehensive cardiology care with a focus on prevention, evidence-based decision-making, and clear education at every visit. Raised in St. George, she has served the community at St. George Regional Hospital since 2012 and transitioned to cardiology practice in 2019, later taking on system leadership as... Read More about Michaela K. Johnson, NP

Nicholas Wittwer is a certified physician assistant specializing in cardiology at Intermountain Health's Southwest Cardiology in St. George and Mesquite. He supports patients in St. George, Mesquite, and surrounding communities, treating hypertension, heart disease, coronary artery disease (CAD), valve problems, heart failure, and more. Nick loves his job and enjoys building relationships with patients and helping them live healthy lives. ... Read More about Nicholas Paul Wittwer, PA

Dr. Zach Williams is a cardiologist at Intermountain Health's Southwest Cardiology in St. George and Mesquite. He supports patients in these communities and treats and diagnoses a wide range of heart and vascular conditions. He is especially passionate about preventive cardiology and empowering patients to make lifestyle changes.  Dr. Williams graduated from the University of Utah School of Medicine in... Read More about Zachary R. Williams, MD

Nicholas Laffely, MD, is a board-certified interventional cardiologist based in St. George, Utah, with over 15 years of experience in the diagnosis, treatment, and prevention of cardiovascular disease. His clinical interests include coronary artery disease, percutaneous coronary intervention (PCI), advanced cardiac imaging, and preventive cardiology. Dr. Laffely is deeply committed to providing the kind of care he would want for... Read More about Nicholas Henry Laffely, MD

Known to patients and colleagues as “Dee,” Deneen M Norman is a board-certified acute care nurse practitioner with two decades of cardiology experience. Her philosophy is simple and unwavering: treat every patient like family  and deliver the best care possible. That commitment is informed by a 15-year foundation as an ICU nurse and prior work as a medical laboratory technician,... Read More about Deneen M. Norman, NP

Shelly Shoultes embodies the heart of nursing, demonstrated by her care, compassion, and clinical expertise. She is originally from West Valley City and made St. George her home in 2013. Passionate about cardiology, structural heart issues, and adult senior care, she is dedicated to advancing patient outcomes through collaborative care and shared decision-making. Shelly practices patient-focused care, encompassing the philosophy articulated... Read More about Shelly Shoultes, NP

Nate is a dedicated provider with a drive to empower patients to make informed decisions for their health, believing that knowledge is the key to achieving optimal well-being. Originally hailing from Tempe, Arizona, Nate has called southern Utah home for the past eight years. His medical journey began when he earned an Associate of Science in Nursing from Utah Tech... Read More about Nathaniel T McCook, NP

Raised in small town Kanab, Utah, I bring compassion, expertise, and experience to my role as a healthcare provider. Guided by the philosophy that every patient deserves the same level of care I would provide my own family; I integrate established protocols, cutting-edge research, and personal intuition to tailor individual treatments for optimal outcomes and return to optimal quality of... Read More about Travis B. Brinkerhoff, NP

Kenneth Lightheart is a cardiologist with subspecialty expertise in nuclear cardiology and a particular interest in transesophageal echocardiography—a relatively low-stress test that lets clinicians see the heart from a unique vantage point. He believes the best decisions are made together, taking time to explain the “why” behind every recommendation so patients can confidently choose the next step in care. Dr.... Read More about Kenneth M. Lightheart, MD

Mikala Larsen is a certified nurse practitioner specializing in cardiology at Intermountain Health’s Southwest Cardiology in St. George, Utah. She supports patients in St. George, Washington City, Hurricane, and surrounding communities, providing comprehensive care and education to patients with heart conditions. Mikala has cultivated a reputation among her patients as a trusted ally in their healthcare journey. She is praised for... Read More about Mikala Larsen, NP

Kimball Hafen is a nurse practitioner specializing in Cardiology Heart Failure at Intermountain Health's Southwest Cardiology in the Heart Failure Clinic. She supports patients and their families in St. George, Ivins, Hurricane, Washington, and surrounding communities, assessing the health status of patients, prescribing treatments, educating patients on their conditions, and collaborating with her team on the next steps for patients.... Read More about Kimball A. Hafen, NP

Coby Christensen, NP, is a cardiologist at Intermountain Health's Southwest Cardiology in St. George. He supports patients and their families in St. George and surrounding communities, treating coronary artery disease, hypertension, hyperlipidemia, and abnormal cardiac rhythms. Coby loves interacting with patients and educating them on different topics within healthcare. Coby was born and raised in Southern Utah and has spent... Read More about Coby L. Christensen, NP