Born in Mansfield, Ohio, Dr. Bayer earned an undergraduate degree in Molecular Genetics and one in Criminology from The Ohio State University in Columbus. He went on to attend medical school at The Ohio State University College of Medicine and Public Health. After medical school, Dr. Bayer moved to Charleston, where he completed an Internal Medicine internship and residency and a Cardiology fellowship at the Medical University of South Carolina. Board certified in cardiovascular diseases and Echocardiography; Dr. Bayer has advanced training in Cardiac Computed Tomography (CT). Additionally, he has been very active in research with numerous publications in the field of advanced cardiovascular imaging. His clinical interests include general clinical cardiology, preventive cardiac care and cardiovascular imaging.�I am passionate about developing a positive personal relationship with�all my patients and helping them live and enjoy their life to their fullest potential.�When not working, Dr. Bayer participates in outdoor activities such as snowboarding, surfing, soccer, and hiking and keeps physically active by running, swimming, biking and working out. He enjoys spending time with his wife, playing with my two sons and three rescue dogs and watching Ohio State sports. Dr. Bayer is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Arrhythmias, Inappropriate Sinus Tachycardia (IST), Familial Ventricular Tachycardia, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement.

Robert Terry is a Cardiologist and an Interventional Cardiologist in Billings, Montana. Dr. Terry has been practicing medicine for over 41 years and is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Pacemaker Implantation, and Aortic Valve Replacement. Dr. Terry is currently accepting new patients.

Blair Erb is a Cardiologist in Ennis, Montana. Dr. Erb is rated as a Distinguished provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Endocarditis, Arrhythmias, Familial Ventricular Tachycardia, and Atrial Fibrillation. Dr. Erb 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 Endocarditis. Her top areas of expertise are Mitral Valve Regurgitation, Atrial Fibrillation, Adenosine Deaminase 2 Deficiency, and Apoplexy. Dr. Spoon 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 Endocarditis. 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.

Bradley Berry is a Cardiologist in Missoula, Montana. Dr. Berry is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Cardiomyopathy, Bicuspid Aortic Valve, Angina, and Atherosclerosis. Dr. Berry is currently accepting new patients.

Melanie Enderwick is an Infectious Disease provider in Missoula, Montana. Dr. Enderwick is rated as an Advanced provider by MediFind in the treatment of Endocarditis. Her top areas of expertise are Osteomyelitis, Strep Throat, Osteomyelitis in Children, and Infective Endocarditis.

Pamela Hiebert is a primary care provider, practicing in Internal Medicine in Bozeman, Montana. Dr. Hiebert has been practicing medicine for over 43 years and is rated as an Experienced provider by MediFind in the treatment of Endocarditis. Her top areas of expertise are Hypothyroidism, Familial Hypertension, Glucocorticoid-Remediable Aldosteronism, and Hypertension.

Shawn Kelly is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Kelly is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Angina, Coronary Heart Disease, Atherosclerosis, Angioplasty, and Atherectomy.

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 Endocarditis. Her top areas of expertise are Coronary Heart Disease, Angina, Atrial Fibrillation, and Atherosclerosis.

Jeffrey Tjaden is an Infectious Disease provider in Bozeman, Montana. Dr. Tjaden is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Osteomyelitis, Hepatitis C, Osteomyelitis in Children, and Hepatitis. Dr. Tjaden is currently accepting new patients.

Joshua Christensen is an Infectious Disease specialist and a Hospital Medicine provider in Missoula, Montana. Dr. Christensen is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Mastoiditis, Infectious Arthritis, Osteomyelitis, Ureteroscopy, and Endoscopy.

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 Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Angina, Coronary Heart Disease, Heart Attack, Metabolic Syndrome, and Pacemaker Implantation.

Anthony Navone is a Cardiologist in Hamilton, Montana. Dr. Navone is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Paroxysmal Supraventricular Tachycardia (PSVT), Atrioventricular Nodal Reentrant Tachycardia (AVNRT), His Bundle Tachycardia, and Atrial Tachycardia. Dr. Navone is currently accepting new patients.

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 an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Unstable Angina, Carotid Artery Disease, and Pacemaker Implantation.

Andrew Carter is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Carter is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Angina, Coronary Heart Disease, Atherosclerosis, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement. Dr. Carter is currently accepting new patients.

Anthony Caffarelli is a Thoracic Surgeon in Missoula, Montana. Dr. Caffarelli is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Bicuspid Aortic Valve, Aortic Dissection, Thoracic Aortic Aneurysm, Heart Valve Repair, and Transcatheter Aortic Valve Replacement (TAVR). Dr. Caffarelli is currently accepting new patients.

Steven Mast is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Mast is rated as an Experienced provider by MediFind in the treatment of Endocarditis. His top areas of expertise are Heart Attack, Angina, Coronary Heart Disease, Pacemaker Implantation, and Heart Bypass Surgery. Dr. Mast is currently accepting new patients.

Originally from Anchorage, Alaska, Dr. Stevens earned her medical degree from the University of Washington School of Medicine in Seattle. She completed both an internship and residency in Internal Medicine through the Medical College of Wisconsin in Milwaukee. Dr. Stevens went on to finish an Infectious Disease fellowship at the University of Utah, which included some pediatric infectious disease training. Board-certified, her clinical interests are inpatient infections with IV antibiotic therapy, TB, Hepatitis C, HIV, pediatric infections and antimicrobial stewardship.�My passion is helping patients through their difficult infection situations and restoring their health.�Married with one daughter, Dr. Stevens unwinds through hiking, trail running, hydroponic gardening, home maintenance projects, traveling and spending time with her family, including her golden doodle, Seamus. Dr. Stevens is rated as an Experienced provider by MediFind in the treatment of Endocarditis. Her top areas of expertise are Infectious Arthritis, Osteomyelitis in Children, Osteomyelitis, and Nontuberculous Mycobacterial Lung Disease.

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 Endocarditis. His top areas of expertise are Adenosine Deaminase 2 Deficiency, Arrhythmias, Familial Ventricular Tachycardia, and Atrial Fibrillation. Dr. Schneider is currently accepting new patients.