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Visiting Specialist 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.

August Visiting Physicians


August 4th                         Dr. Michael Eisenhauer                                 406-455-4320              

August 4th                         Ellen Sparks PA-C                                         406-454-2171


August 26th                        Dr. Deborah Hoffman                                   406-257-8992


August 10th                          Dr. Thomas Warr                                             406-771-3060    


August 24th                          Dr. Chad Engan                                               406-271-3231


August 13th                           Dr. Calvin Schlepp                                           406-271-3231

OPHTHALMOLOGIST: Cataract Surgeries

August 16th                           Dr. David Boes                                                  406-455-2020




Ellen is a graduate from Truman State University in Kirksville, Missouri, where she earned her Bachelor of Science in Health Science degree in 2003. She then went on to complete her Master of Science in Orthotics and Prosthetics at the Georgia Institute of Technology in Atlanta, Georgia in 2005. Ellen then decided to return to Wichita State University in Wichita, Kansas to graduate with a Master of Science in Physician Assistant studies in 2010. Ellen is an active member of the American Academy of Physician Assistants and the American Geriatrics Society. Ellen has a strong academic and clinical experience and has been working in Colorado as a physician assistant since 2010. She is excited to bring her expertise to her practice in the Great Falls community. In her spare time, Ellen enjoys spending time with family, hiking, gardening and cooking.

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

Shawn Kelly, MD

Dr. Shawn Kelly is a cardiologist who specializes in interventional cardiology – he’s the kind of physician who can save lives.

For Dr. Kelly, practicing cardiology is personal. He was inspired to pursue his career after his father endured a serious heart attack, and an important part of Dr. Kelly’s practice is building relationships with patients and getting to know them.

While Dr. Kelly follows thoughtful, evidence-based medicine in treating his patients, he also encourages patients to trust and listen to themselves. “If you’re experiencing symptoms, like shortness of breath, talk to your provider about how you’re feeling – even if the tests say otherwise,” he advises.

Dr. Kelly enjoys a variety of outdoor activities, spending time with his family, skiing, and woodworking.



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 


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



Calvin Schlepp, MD-Orthopedic Surgeon

Dr. Calvin Schlepp grew up on a family farm/ranch near Conrad, Montana. He attended Carroll College before completing medical school at the University of Washington/WWAMI. He then completed his Orthopedic Surgery Residency Training at the University of Washington/Harborview Medical Center in Seattle and at Fellowship in Sports Medicine and Arthroscopy in Taos, New Mexico. He has experience treating collegiate and professional athletes at the University of Washington and with the US Ski Team.

Besides specialized training in sports medicine, he has a particular interest in fracture care, anterior total hip replacements, and partial knee replacement surgery. In his spare time, Dr. Schlepp enjoys fly fishing, hunting, mountain biking, skiing, backpacking, traveling, and spending time with his friends and family.

“My priority is to always to match the best treatment option with the patient's goals and demands. Sometimes that is therapy alone, sometimes arthroscopic or minimally invasive surgery, and sometime major surgery like joint replacements, but whatever is needed, my team at the Helena Orthopedic Clinic is here to get you back to doing the things you love, as soon as possible.” – Dr. Calvin Schlepp

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