Visiting Physician Schedule

These Physicians will be visiting our Clinic on the dates posted below. 
If you are interested in making an appointment please call the number listed.




11/13: Dr. Shawn Kelly


No Nov. Date: Dr. Deborah Hoffman


11/12, 11/26: Dr. Thomas Warr


11/21: Dr. David Healy


11/7: Dr. Chad Engan


11/8: Dr. Calvin Schlepp


11/11: Dr. David Boes




Dr. Brennan joined Benefis Heart and Vascular in early July of 2018.  He practices general cardiology and  interventional cardiology including implantation of pacemakers and defibrillators.  Dr. Brennan previously lived and worked in Great Falls in the late 1990s.  Montana has always held a special place in his heart and he is excited to be back.  He is an avid hiker and great lover of the outdoors.   

Dr. Brennan received his medical degree from the University of Southern California in Los Angeles. He completed his internship and residency in internal medicine at the University of Southern California, and completed his residence in radiology at Rhode Island Hospital in Providence, RI. He completed his fellowship in cardiology at Northwestern University Medical Center in Chicago, his fellowship in invasive and interventional cardiology at St. Vincent Medical Center, LA Heart Institute, his fellowship in interventional cardiology at Kaiser Foundation Hospital in Los Angeles, and his fellowship in electrophysiology, catheter ablation, pacemaker implantation, and follow-up at the University of California San Diego.

Dr. Brennan is board certified in Internal Medicine, Cardiovascular Disease, and Clinical Cardiac Electrophysiology. Dr. Brennan is a member of the American College of Cardiology. To schedule an appointment with Dr. Edmund Brennan, call Benefis Heart and Vascular Institute at 406-455-4320

Dr. Castriz specializes in non-invasive/general cardiology, interventional cardiology, peripheral arterial disease, and peripheral angiography/interventions. Dr. Castriz graduated from University Central del Este, San Pedro de Macoris, Dominican Republic, 1984. He completed is internship, residency, and fellowship at University of Oklahoma Health Science Center. Dr. Castriz is board certified in Internal Medicine, Cardiovascular Diseases and Interventional Cardiology as well as a fellow of the American College of Cardiology. Dr. Castriz is accepting new patients and physician referrals at the Pondera Medical Center Clinic.   

Schedule an appointment with Dr. Castriz by calling the Great Falls Clinic at 406-454-2171. 




Otolaryngologist David Healy Jr., MD, joined the practice of Glacier ENT in August 2015.The U.S. Navy Medical Corps commander comes to PMC from Portsmouth, Virginia, where he held several leadership positions with the Naval Medical Center Portsmouth. Dr. Healy earned his medical degree from the Uniformed Services University of the Health Sciences, and then completed both his general surgery internship and otolaryngology residency at the Naval Medical Center San Diego. He received his Board Certification in otolaryngology and trained further under a rhinology fellowship with Harvard Medical School, Massachusetts Eye & Ear Infirmary. Dr. Healy achieved the rank of captain in the United States Marine Corps, and served as an infantry battalion surgeon during Operation Iraqi Freedom. He also was an otolaryngologist with the Tripler Army Medical Center before transitioning to his role in Portsmouth. He enjoys spending his leisure time with his family of five in the great outdoors of Montana.

Please call Glacier Ear Nose & Throat at 406-752-8330 if you would like to make an appointment.


CHAD ENGAN, MD, FACS- General Surgery

Dr. Engan received his medical degree from New York Medical College in Valhalla, New York.  He completed his UCSD Surgical Residency in Bakersfield, California.  He has contributed to several presentations and publications; his most recent publication “Description of RASS-TAPP Inguinal Hernia Repair and Presentation of Clinical Outcomes” was released in June 2015 in Hernia-The World Journal of Hernia and Abdominal Wall Surgery.  Dr. Engan has been practicing General Surgery at a Private Practice since 2005, and prior to that was a General Surgeon for the Great Falls Clinic.  Dr. Engan serves on many committees and organizations. He is currently medical director for the Robotics Program, as well as the Trauma Program at Benefis Health Systems, the director and instructor for the Advanced Trauma and Life Support Course, and the Regional Trauma Chair for the Central Montana Region.  Dr. Engan is also a member of the American College of Surgeons, Eastern Association for the Surgery of Trauma, American Society of Breast Surgeons, the Clinical Robotic Surgery Association, as well as two Hernia Societies.  When Dr. Engan is not in surgery or serving on a committee or board, he enjoys playing chess, golf, and reading Russian Literature. 

Dr. Engan serves the needs of PMC Patients for: General and Advanced Laparoscopic Surgery, Surgical Oncology, Endocrine Surgery, Gastrointestinal and Varicose Vein Surgery, Breast Surgery. To schedule an appointment in Conrad contact 406-271-3231

"I believe in taking time to listen to my patients and in providing excellent surgical care both preoperatively as well as postoperatively." - Chad Engan, MD 



Dr. Harrer graduated from the University of Texas Medical School at Houston in 1981. He works in Great Falls, MT and specializes in Hematology/Oncology. Dr. Harrer is affiliated with Benefis Health System Main Campus and Benefis Health System West Campus.


TOM WARR, MD, Onocologist

Thomas Warr received his medical degree from Vanderbilt University in Nashville, Tennessee. He completed his residency and chief residency in Internal Medicine and then his fellowship in the hematology and oncology division and the department of medicine at the University of California in San Diego, CA. He has contributed to several publications and abstracts. Dr. Warr practiced hematology and oncology in Great Falls for 21 years, during which time he was also medical director of Peace Hospice of Montana, of the American Red Cross, and of Benefis Cancer Conference. Dr. Warr is very active in clinical research. More recently, he has been in practice in California, but is pleased to return to Big Sky Country.

Schedule an appointment contact Great Falls Clinic at 406-771-3060.



Dr. David A. Boes is a fellowship trained ophthalmologist, and specializes in cataract surgery and glaucoma surgery.      Dr. Boes received his medical degree from the University of Nebraska Medical Center in Omaha, Nebraska. He completed his internship and residency at the University of Washington Medical Center in Seattle, Washington, and his fellowship at Wills Eye Hospital in Philadelphia, Pennsylvania.    Dr. Boes is board certified with the American Board of Ophthalmology. Dr. Boes is affiliated with the American Society of Cataract and Refractive Surgeons, the American Academy of Ophthalmology, the Montana Academy of Ophthalmology, and the Alpha Omega Alpha Honor Medical Society.  

To schedule an appointment with Dr. Boes, call Boes Eye Care at 406-455-2020.



DEBORAH HOFFMAN, MD, Pulmonary Disease and Sleep Medicine

Deborah Hoffman, MD, comes to Pondera Medical Center as a new provider at Rocky Mountain Heart and Lung. She brings 20 years of expert care and experience focused on pulmonology, critical care and sleep medicine. Her approach to healthy living is rooted in a balance of good nutrition, regular exercise and restorative sleep. Dr. Hoffman earned her medical degree from the University of Miami in Florida and subsequently headed west for her residency and fellowship work at the University of California, San Diego in internal medicine and pulmonary and critical care. She has a robust background in the study of sleep apnea and believes that identifying untreated sleep disorders can help positively impact patients’ lives and reduce associated medical costs. She offers comprehensive skills to help screen, educate, test, manage and track sleep patterns to alleviate sleep apnea, maximize wellness and improve the quality of life for her patients. Dr. Hoffman also will be sharing her expertise as medical director for Kalispell Regional Healthcare’s Outreach Sleep Medicine Programs, providing this much-needed service to the greater Flathead community and northwest Montana. Dr. Hoffman heeds her own advice and stays active and healthy as a long-distance endurance runner and cyclist as well as a four-time Ironman triathlete.

Certifications: American Board of Internal Medicine / Pulmonary Disease / Critical Care / Sleep Medicine

Fellowships: University of California, San Diego – internal medicine and pulmonary and critical care

Medical School: University of Miami; Residency: University of California, San Diego




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