Dr. Ritchie offers the full complement of cardiology services including arterial catheterization; temporary pacemakers; conventional and stress echocardiography, transesophageal echocardiography as well as exercise and pharmacologic stress testing. He also brings his expertise in all aspects of coronary angioplasty, including structural heart disease such as closure of atrial septal defects, balloon valvuloplasties; and peripheral angiography (AAA endovascular stent grafts, renal artery stents), DCA, rotablator, brachytherapy, IVUS and physiologic lesion assessment. Dr. Ritchie is board certified in Internal Medicine, Cardiovascular Diseases and Interventional Cardiology. Dr. Ritchie completed his undergraduate work at the University of Evansville, where he played baseball for three years. He attended medical school at Indiana University, where he graduated with highest honors in 1986. He then went on to complete his residency at Case Western Reserve School of Medicine in Cleveland in 1989. From there, he went on to complete his fellowship at Washington University in Saint Louis, where he performed clinical rotations while receiving interventional training. In his spare time Dr. Ritchie enjoys hiking, fishing, hunting, biking and spending time with friends and family. Dr. Ritchie is rated as a Distinguished provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Unstable Angina, Carotid Artery Disease, and Pacemaker Implantation.

Barbara Dudczak is a Cardiologist in Billings, Montana. Dr. Dudczak is rated as a Distinguished provider by MediFind in the treatment of Patent Foramen Ovale. Her top areas of expertise are Aortic Regurgitation, Coronary Heart Disease, Necrosis, and Pediatric Myocarditis. Dr. Dudczak is currently accepting new patients.

William Hull is a Cardiologist in Anaconda, Montana. Dr. Hull is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Angina, Atrial Fibrillation, Sick Sinus Syndrome, and Atherosclerosis. Dr. Hull is currently accepting new patients.

Alexander Jehle is a Cardiologist in Polson, Montana. Dr. Jehle is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Adenosine Deaminase 2 Deficiency, and Coronary Heart Disease. Dr. Jehle is currently accepting new patients.

Jocelyn Spoon is a Cardiologist in Plains, Montana. Dr. Spoon is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. Her top areas of expertise are Mitral Valve Regurgitation, Atrial Fibrillation, Adenosine Deaminase 2 Deficiency, and Apoplexy. Dr. Spoon is currently accepting new patients.

James Maddux is an Interventional Cardiologist in Polson, Montana. Dr. Maddux is rated as an Advanced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Hypertrophic Cardiomyopathy (HCM), Subvalvular Aortic Stenosis, Cardiomyopathy, Aortic Valve Replacement, and Transcatheter Aortic Valve Replacement (TAVR). Dr. Maddux is currently accepting new patients.

Dr. Jorge (pronounced “George”) Castriz is a board certified interventional cardiologist. Dr. Castriz offers the full complement of cardiology services including arterial catheterization, biventricular pacing, temporary pacemakers, conventional and stress echocardiography as well as exercise and pharmacologic stress testing. He also brings his expertise in all aspects of peripheral angiography and coronary angioplasty (AAA endovascular stent grafts, renal artery stents, angioplasty, DCA, rotablator, brachytherapy, IVUS and physiologic lesion assessment). Dr. Castriz is board certified in Internal Medicine, Cardiovascular Diseases and Interventional Cardiology and is a fellow of the American College of Cardiology. Prior to joining the Great Falls Clinic in 2013, Dr. Castriz maintained an active practice with the Cardiovascular Medical Specialists of the Palm Beaches in Jupiter, Florida. Prior to that, Dr. Castriz owned a private practice in Palm Beach Gardens, Florida for nine years. Dr. Castriz received his medical degree from the University Central Del Este in the Dominican Republic. He completed his internship and residency in Internal Medicine, and his fellowship in Interventional Cardiology at the University of Oklahoma Health Science Center in Oklahoma City, OK. Dr. Castriz is rated as an Advanced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Angina, Coronary Heart Disease, Heart Attack, Metabolic Syndrome, and Pacemaker Implantation.

Robert Terry is an Interventional Cardiologist and a Cardiologist in Bozeman, Montana. Dr. Terry is rated as an Advanced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Pacemaker Implantation, and Aortic Valve Replacement. Dr. Terry is currently accepting new patients.

Kimberly Atianzar is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Atianzar is rated as an Advanced provider by MediFind in the treatment of Patent Foramen Ovale. Her top areas of expertise are Mitral Valve Regurgitation, Aortic Valve Stenosis, Mitral Stenosis, Aortic Valve Replacement, and Transcatheter Aortic Valve Replacement (TAVR).

Collin Fischer is a Cardiologist in Billings, Montana. Dr. Fischer is rated as an Advanced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Aortic Regurgitation, Pediatric Myocarditis, Vasculitis, Pacemaker Implantation, and Cardiac Ablation. Dr. Fischer is currently accepting new patients.

Michael Reed is an Interventional Cardiologist in Missoula, Montana. Dr. Reed is rated as an Advanced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Coronary Heart Disease, Heart Attack, Aortic Valve Stenosis, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement. Dr. Reed is currently accepting new patients.

Dr. Gerasimou has been practicing medicine in Montana for over 20 years. Formerly an interventional cardiologist for 19 years, Dr. Gerasimou transitioned her practice to general cardiology in July 2021. Dr. Gerasimou specializes in all aspects of cardiology and brings with her an extensive cardiac background. Dr. Gerasimou attended Saint Francis University in Loretto, Pennsylvania for her Bachelor of Science in Biology in 1987. She then went on to complete her medical degree from the American University in Montserrat in 1991. She completed her residency in Internal Medicine at the Danbury Hospital in Connecticut in 1994 and her cardiology fellowship at the University of Iowa in 1997. After completing schooling, Dr. Gerasimou accepted her first job as a cardiologist at the Great Falls Clinic in 1998. We are excited to welcome her back to our team full-time! In her spare time, Dr. Gerasimou enjoys spending time with her family and friends. She also enjoys hiking, fly-fishing, skiing and her Peloton bike. Dr. Gerasimou is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. Her top areas of expertise are Coronary Heart Disease, Angina, Atrial Fibrillation, and Atherosclerosis.

Robert Mitchell is a Cardiologist and a Vascular Surgeon in Kalispell, Montana. Dr. Mitchell is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Atrial Fibrillation, Aortic Regurgitation, Arrhythmias, Pediatric Myocarditis, and Pacemaker Implantation. Dr. Mitchell is currently accepting new patients.

Michael Hagan is a primary care provider, practicing in Internal Medicine in Billings, Montana. Dr. Hagan is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Chronic Kidney Disease, Breast Cancer, Glucocorticoid-Remediable Aldosteronism, and Familial Hypertension. Dr. Hagan is currently accepting new patients.

Steven Goldberg is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Goldberg is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Mitral Valve Regurgitation, Heart Attack, Atrial Septal Defect (ASD), Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement. Dr. Goldberg is currently accepting new patients.

Tyler Slyngstad is a Cardiologist and an Interventional Cardiologist in Miles City, Montana. Dr. Slyngstad is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Angina, Coronary Heart Disease, Atherosclerosis, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement.

Daniel Spoon is an Interventional Cardiologist in Missoula, Montana. Dr. Spoon is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Coronary Heart Disease, Mitral Valve Regurgitation, Angina, Aortic Valve Replacement, and Transcatheter Aortic Valve Replacement (TAVR). Dr. Spoon is currently accepting new patients.

Preston Schneider is a Cardiologist and a Hospital Medicine provider in Bozeman, Montana. Dr. Schneider has been practicing medicine for over 16 years and is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Adenosine Deaminase 2 Deficiency, Arrhythmias, Familial Ventricular Tachycardia, and Atrial Fibrillation. Dr. Schneider is currently accepting new patients.

Blair Erb is a Cardiologist in Ennis, Montana. Dr. Erb is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Endocarditis, Arrhythmias, Familial Ventricular Tachycardia, and Atrial Fibrillation. Dr. Erb is currently accepting new patients.

Joseph Krezowski is a Cardiologist in Chester, Montana. Dr. Krezowski is rated as an Experienced provider by MediFind in the treatment of Patent Foramen Ovale. His top areas of expertise are Aortic Regurgitation, Atrial Fibrillation, Pediatric Myocarditis, Angioplasty, and Pacemaker Implantation. Dr. Krezowski is currently accepting new patients.