Our Doctors

All of the doctors at Interventional Radiology of Colorado are fellowship-trained experts in minimally invasive, image guided treatment options. An Interventional Radiology fellowship is an additional year of intense, focused study and practice of image-guided procedures using special instruments that operate in and out of the body.

Several of the physicians with Interventional Radiology of Colorado have been featured as 5280 Top Doctors – voted by their peers for excellence in patient care and advancing medicine in Denver, Colorado. 

Meet our team of Interventional Radiologists.

Shawn Ahmed, M.D., Ph.D.

Interventional Radiologist

Arthur H. Donahue, D.O.

Interventional Radiologist

Sangeeta Grewal, M.D.

Interventional Radiologist

Peder E. Horner, M.D.

Interventional Radiologist

Samuel L. McMurry, D.O.

Interventional Radiologist

Earl E. Schott, III, M.D.

Interventional Radiologist

Less Recovery Time Less Risk Less Pain Better Results

You’ve Been Diagnosed. What’s Next?

Schedule a consultation with one of our doctors to determine if an interventional radiology procedure is the right option for you.

By requesting an appointment, you agree to our privacy policy.

Shawn Ahmed, M.D., Ph.D.

Fellowship Trained Vascular & Interventional Radiologist

Primary Specialty | Vascular & Interventional Radiology

Medical School | Creighton University School of Medicine, Omaha, NE

Residency | University of Minnesota Medical Center, Minneapolis, MN

Fellowship | Massachusetts General Hospital, Boston, MA

Memberships

  • American Medical Association
  • American College of Radiology
  • Radiological Society of North America

Dr. Shawn Ahmed is a board certified radiologist specializing in Vascular & Interventional Radiology. Dr. Ahmed began his medical career at Creighton University in Omaha, NE where he performed cancer research from 1999-2008. He earned a Ph.D. in Bio-Organic Chemistry in 2004 from Creighton University School of Medicine’s Department of Biomedical Sciences. He subsequently received his M.D. at Creighton University School of Medicine in 2008. Dr. Ahmed performed his internship at Hennepin County Medical Center in Minneapolis, MN in 2008 followed by a residency in Diagnostic Radiology at the University of Minnesota Medical Center where he trained from 2009-2013. He subsequently performed a fellowship in Vascular Interventional Radiology at Harvard Medical School’s world-renowned Massachusetts General Hospital in Boston, MA.

Throughout his education, training, and career, Dr. Ahmed has been very active in the medical community through his key involvement in several peer-reviewed journal publications, abstracts, and presentations.

Dr. Ahmed is married with five children. In his spare time, he enjoys skiing, hiking and traveling.

Arthur H. Donahue, D.O.

Fellowship Trained Vascular & Interventional Radiologist

Primary Specialty | Vascular & Interventional Radiology

Medical School | Des Moines University – Osteopathic Medical Center

Residency | Michigan State University/Henry Ford Wyandotte, Wyandotte, MI

Fellowship | University of Pittsburgh Medical Center, Pittsburgh, PA

Memberships

  • American Osteopathic College of Radiology
  • Society of Interventional Radiology

Dr. Arthur Donahue is a board certified radiologist specializing in Vascular & Interventional Radiology. He received his DO at Des Moines University – Osteopathic Medical Center. He continued his training at Michigan State University/Henry Ford Wyandotte in Wyandotte, MI, where he received his Radiology Residency training. He then completed Fellowship training at University of Pittsburgh Medical Center in Pittsburgh, PA.

Beginning his medical career as a PharmD, Dr. Donahue brings a unique perspective to his work as a physician. He has been very active in the medical community through his participation in numerous publications and research projects as well as various medical society involvement.

On a personal note, Dr. Donahue enjoys running, golf, pheasant hunting, skiing, reading, rock climbing and aviation.

Sangeeta Grewal, M.D.

Fellowship Trained Vascular & Interventional Radiologist

Primary Specialty | Vascular and Interventional Radiology

Medical School | University of Kansas School of Medicine, Kansas City, KS

Residency | University of California Los Angeles Medical Center

Fellowship | University of California Los Angeles Medical Center

Memberships

  • Alpha Omega Alpha
  • American College of Radiology
  • Radiological Society of North America
  • Society of Interventional Radiology

Dr. Geeta Grewal is Board Certified in Diagnostic Radiology, and received a CAQ in Vascular and Interventional Radiology. She is a graduate of the University Of Kansas School Of Medicine, where she was a member of the Alpha Omega Alpha Honor Society and earned her MD.  She did both her Diagnostic Radiology residency and fellowship (Vascular and Interventional Radiology) training at University of California Los Angeles Medical Center.

Dr. Grewal comes to us with over 7 years of professional experience in Interventional Radiology, Cardiac Imaging and Diagnostic Radiology. Additionally, she is fluent in conversational and medical Spanish.

Her interests are traveling, watching NFL football, spending time with family and watching movies of all types.

Peder E. Horner, M.D.

Fellowship Trained Vascular & Interventional Radiologist

Primary Specialty | Vascular & Interventional Radiology, Diagnostic Radiology

Medical School | University of Kansas School of Medicine, Kansas City, KS

Residency | Oregon Health and Science University, Portland, OR

Fellowship | Dotter Interventional Institute at Oregon Health and Science University, Portland, OR

Memberships

  • American College of Radiology
  • Alpha Omega Alpha Honor Medical Society
  • Society of Interventional Radiology
  • Western Angiographic and Interventional Society

Dr. Peder E. Horner is a Board Certified Radiologist specializing in Vascular, Interventional and Diagnostic Radiology.  Dr. Horner completed his undergraduate degree (BS, Genetics) at the University of Kansas in Lawrence, KS.  Dr. Horner obtained his M.D. at the University of Kansas School of Medicine in Kansas City, KS. His Diagnostic Radiology residency education was obtained at the Oregon Health and Science University in Portland, OR.  Following radiology Board Certification, he chose to pursue a Vascular and Interventional Radiology fellowship at the esteemed Dotter Interventional Institute at Oregon Health and Science University. He has a Certificate of Added Qualification in Vascular and Interventional Radiology.

He has strong clinical interests in interventional oncology (including Yttrium 90 radioembolization and tumor ablation), uterine fibroid embolization (UFE), acute and chronic DVT management, Prostate Artery Embolization (PAE) for enlarged prostate (Benign Prostatic Hypertrophy/BPH), and peripheral vascular disease. He is also part of a select multi-disciplinary group of specialized physicians  at the Denver Clinic for Extremities at Risk treating osteosarcoma with their unique intra-arterial chemotherapy protocol. Dr. Horner was recently voted by his peers as one of Denver’s Top Doctors in 5280 Magazine.

Dr. Horner currently resides in Denver, Colorado. An avid cyclist, he races competitively year-round, including road, mountain bike, and cyclocross disciplines in Colorado and nationally. He can also readily be found skiing, hiking, and camping with his wife and two school-age children. Follow him on Twitter @IR_doctor.

Samuel L. McMurry, D.O.

Fellowship Trained Vascular & Interventional Radiologist

Primary Specialty | Vascular & Interventional Radiology

Medical School | Oklahoma State University College of Medicine, Tulsa, OK

Residency | University of Arkansas for Medical Sciences (UAMS) College of Medicine, Little Rock, AR

Fellowship | University of Colorado

Memberships

  • Society of Interventional Radiology
  • American College of Radiology
  • Radiological Society of North America
  • American Roentgen Ray Society
  • Mid-American Interventional Radiology Society
  • European Radiologic Society
  • Association of University Radiologists
  • Sigma Sigma Phi – Honors society for osteopathic medical students

Dr. McMurry is a board-certified radiologist specializing in Vascular and Interventional Radiology. He earned his DO at Oklahoma State University College of Medicine in Tulsa, and continued his training at University of Arkansas for Medical Sciences (UAMS) College of Medicine in Little Rock, where he received his Radiology Residency training. Dr. McMurry received his Fellowship training in Interventional Radiology at University of Colorado.

Throughout his education and training, Dr. McMurry received numerous honors and awards, including induction into Sigma Sigma Phi National Honor Society and multiple scholarships. Further, Dr. McMurry has contributed to several publications and scientific presentations as well as sharing his expertise through volunteer, leadership, and teaching roles.

On a personal note, he enjoys spending time with his wife and three sons, dirt biking, mountain biking, and skiing/snowboarding.

Earl E. Schott, III, M.D.

Fellowship Trained Vascular & Interventional Radiologist

Primary Specialty | Vascular & Interventional Radiology

Medical School | Northwestern University, Chicago, IL

Residency | University of Florida, Gainesville, FL

Fellowship | University of Florida, Gainesville, FL

Memberships

  • American College of Radiology
  • Colorado Radiological Society
  • Society of Interventional Radiology

Dr. Schott is board certified in Interventional and Diagnostic Radiology. He earned his MD at Northwestern University in Chicago and continued his training with Radiology Residency and Interventional Fellowship at the University of Florida in Gainesville.

As a recent President of a Denver physician group, Rocky Mountain Radiologists, Dr. Schott comes to us with great experience in the private practice setting and in working with the various elements of the local hospital environment.

Illustrating his academic side, Dr. Schott co-authored a May 2020 article in Pulmonary Medicine. His extra efforts in patient care were acknowledged with a hospital-wide “Best Catch to Prevent Harm” award for the year 2018.

In his free time, Dr. Schott pursues outdoor activities such as running, golf, and exploring Colorado’s mountains. He also travels whenever possible and has visited almost all 50 states and close to 30 foreign countries.

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