Cardiologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Chiropractor providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dentist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dermatologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Family Physician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
OB-GYN providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Ophthalmologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Orthopedic Surgeon providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Pediatrician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Physical Therapist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Podiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Psychiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Medical School: University of Cincinnati College of Medicine – Cincinnati, OH
Internship
Internal Medicine: Rush-Presbyterian-St. Luke’s Medical Center – Chicago, IL
Residency
Diagnostic Radiology: Tulane University Medical Center – New Orleans, LA
Fellowship
Neuroradiology/Endovascular Surgical Neuroradiology: Mallinckrodt Institute of Radiology,
Washington University – St. Louis, MO
Board Certifications
American Board of Radiology 1994
Certificate of Added Qualifications in Neuroradiology 1996
Donald Frei, MD, is one of the board-certified neurointerventional surgeons at RIA Neurovascular in Englewood, Colorado.
Dr. Frei earned his Doctor of Medicine at the University of Cincinnati College of Medicine, in Cincinnati, Ohio. He served his internship at Rush-Presbyterian-St. Luke's Medical Center in Chicago, before continuing his training with a diagnostic radiology residency at Tulane University Medical Center in New Orleans.
Dr. Frei went on to complete rigorous fellowship training in neuroradiology / endovascular surgical neuroradiology at Washington University's Mallinckrodt Institute of Radiology in St. Louis. Dr. Frei has also contributed to several articles in peer-reviewed journals. In addition to his certification through the American Board of Radiology, he also has a certificate of added qualifications in neuroradiology.
He provides a wide range of neurointerventional services and has specific interest in the endovascular treatment of acute stroke, intracranial aneurysms, and extracranial revascularization techniques. He also offers minimally invasive procedures, including catheter-directed stroke intervention, angioplasty, stent revascularization, and treatments for cerebral aneurysms and arteriovenous malformations (AVMs).
Medical School: University of Washington – Seattle, WA
Internship
Surgery/Medicine: Swedish Medical Center – Seattle, WA
Residency
Diagnostic Radiology: University of Washington – Seattle, WA
Fellowship
Vascular/Interventional Radiology: University of Washington – Seattle, WA
Board Certifications
American Board of Radiology 2006
Vascular and Interventional Radiology Certificate of Added Qualification 2008
Todd Kooy, MD, is a highly regarded board-certified vascular and interventional radiologist serving patients at RIA Endovascular in Greenwood Village, Colorado. Dr. Kooy specializes in treating vascular issues using cutting-edge interventional radiology procedures that offer patients benefits like less pain, faster recovery times, and minimized scarring.
Dr. Kooy attended the University of Washington in Seattle, where he earned his medical degree, setting the stage for his medical career.
Continuing his medical training, Dr. Kooy completed a comprehensive internship in surgery and medicine at Swedish Medical Center in Seattle. His dedication and passion for the field prompted Dr. Kooy to pursue a diagnostic radiology residency at the University of Washington. This rigorous program equipped him with a strong foundation in radiology.
Dr. Kooy completed a fellowship at the University of Washington in Seattle to refine his expertise in vascular and interventional radiology. He holds board certifications from the American Board of Radiology and a Vascular and Interventional Radiology Certificate of Added Qualification (CAQ). These certifications highlight Dr. Kooy’s commitment to providing his patients with advanced care.
With a dedication to ongoing learning and delivering superior patient care, Dr. Kooy strives to give each patient the personalized treatment they deserve at RIA Endovascular.
Medical School: University of Chicago Pritzker School of Medicine – Chicago, IL
MBA: University of Chicago Graduate School of Business – Chicago, IL Internship
Transitional: Resurrection Hospital – Chicago, IL
Residency
Diagnostic Radiology: University of Washington Medicine – Seattle, WA
Fellowship
Interventional Radiology: University of Washington Medicine – Seattle, WA
Board Certification
American Board of Radiology 2010
Peter Stratil, MD, MBA, is the Medical Director of RIA Endovascular. He also practices as a vascular interventional radiologist from the RIA Endovascular location in Greenwood Village, Colorado. Dr. Stratil performs minimally invasive procedures, treating conditions like cancer and vascular disease.
Dr. Stratil earned his medical degree from the University of Chicago Pritzker School of Medicine in Chicago, Illinois, and his MBA from the University of Chicago Graduate School of Business. In addition to interpreting radiology studies, he is also skilled in business development for radiology practice.
After a transitional internship at Resurrection Hospital in Chicago, Illinois, Dr. Stratil completed a residency in diagnostic radiology and a fellowship in interventional radiology at the University of Washington Medicine in Seattle.
Dr. Stratil is board-certified by the American Board of Radiology. He has co-authored publications on embolotherapy for visceral trauma, vascular imaging, pediatric radiology, and giant cell tumors. He has also presented on the business of radiology before the Association of University Radiologists.
Medical School: University of Texas Southwestern Medical School – Dallas, TX
Internship
General Surgery: Indiana University School of Medicine – Indianapolis, IN
Residency
Diagnostic Radiology: University of Texas Southwestern Medical Center – Dallas, TX
Fellowship
Vascular & Interventional Radiology: The Western Pennsylvania Hospital – Pittsburgh, PA
Board Certifications
American Board of Radiology 1997
Certificate of Added Qualification in Vascular and Interventional Radiology 1999
American College of Phlebology – Member 2009
Ben Kassanoff, MD, is a board-certified vascular and interventional radiologist with RIA Endovascular serving patients in Denver, Colorado. Dr. Kassanoff is deeply committed to delivering exceptional care and innovative solutions to patients seeking treatment for various vascular and interventional radiology procedures.
Dr. Kassanoff earned his medical degree from the University of Texas Southwestern Medical School in Dallas, Texas. Continuing his medical education, Dr. Kassanoff embarked on a general surgery internship at Indiana University School of Medicine in Indianapolis, Indiana.
Dr. Kassanoff’s dedication to the field led him to pursue a residency in diagnostic radiology at the University of Texas Southwestern Medical Center in Dallas. This rigorous program provided him with a solid foundation and advanced skills in radiology.
Dr. Kassanoff sought advanced training through a fellowship at The Western Pennsylvania Hospital in Pittsburgh to refine his vascular and interventional radiology specialization.
In recognition of his expertise, Dr. Kassanoff obtained board certifications from the American Board of Radiology and a Certificate of Added Qualification in Vascular and Interventional Radiology. He also became a member of the American College of Phlebology in 2009.
Dr. Kassanoff’s areas of interest include peripheral vascular intervention, genitourinary intervention, vertebroplasty/kyphoplasty, and complex venous access procedures.
With his extensive education, certifications, and dedication to exceptional patient care, Dr. Kassanoff continues to impress patients and colleagues at RIA Endovascular.
Medical School: University of Colorado School of Medicine – Aurora, CO
Internship
Internal Medicine: Basset Medical Center – Cooperstown, NY
Residency
Diagnostic Radiology: University of Colorado – Aurora, CO
Fellowship
Interventional Radiology: Mayo Clinic – Rochester, MN
Board Certification
American Board of Radiology 2024
Samuel Tesfalidet, MD, is a board-certified interventional radiologist at the Greenwood Village, Colorado office of RIA Endovascular. Dr. Tesfalidet is highly skilled with many years of experience in radiology, caring for patients of all ages.
Dr. Tesfalidet’s childhood dream was to become a physician. He earned his medical degree at the University of Colorado School of Medicine in Aurora and completed an internship in internal medicine at Bassett Medical Center in Cooperstown, New York.
Dr. Tesfalidet also completed a residency in diagnostic radiology at the University of Colorado in Aurora and a fellowship in interventional radiology at the Mayo Clinic in Rochester, Minnesota.
He loves physiology and the diversity involved in practicing interventional radiology.
Dr. Tesfalidet uses the latest advances in radiology technologies and procedures, frequently using new applications building on his core set of procedural skills.
He enjoys interacting with and caring for patients in all life stages. He skillfully diagnoses medical conditions and helps treat patients undergoing minor procedures as well as major procedures needed for life-threatening problems.
When he’s not at the RIA Endovascular office, Dr. Tesfalidet enjoys spending time with his friends and family, traveling internationally, and exploring national and state parks. He also enjoys camping, hiking, fishing, and skiing.
Dr. Tesfalidet welcomes new and existing patients to RIA Endovascular and looks forward to improving their health and well-being.
Medical School: University of Virginia School of Medicine – Charlottesville, VA
Residency
Interventional Radiology: Michigan Medicine – Ann Arbor, MI Riverside Medical Center – Newport News, VA
Fellowship
Interventional Radiology: Michigan Medicine – Ann Arbor, MI
Nishant Patel, MD, MBA, is an experienced interventional radiologist working at the RIA Endovascular office in Greenwood Village, Colorado.
The son of two physicians, Dr. Patel originally studied biochemistry before graduating from the University of Virginia School of Medicine in Charlottesville, Virginia. He completed a fellowship and residency in interventional radiology at Michigan Medicine and a residency at Riverside Medical Center in Newport News, Virginia.
Dr. Patel has co-authored publications on topics including interventional radiology-operated endoscopy, interventional radiology-operated cholecystoscopy, gastroduodenal and pancreatic surgical techniques and imaging, post-operative colon and urinary diversion surgical techniques and imaging, imaging of presacral masses, and endovascular thrombolysis for extremity frostbite.
Among his honors and awards, Dr. Patel is the recipient of the American College of Radiology’s Radiology Leadership Summit Scholarship, the Michigan Society of Interventional Radiology Resident Research Award (First Place), and the ACR Gold Merit Award.
Today, Dr. Patel provides care for new and existing patients dealing with medical issues such as peripheral artery disease. He emphasizes the need for medical knowledge, imaging skills, and mental openness when interpreting imaging results. In his practice as an interventional radiologist, he works with clinicians in every specialization and provides direct patient care.
When not at work, Dr. Patel relaxes by playing volleyball and listening to electronic music at home or in concert.
2019 Denver’s Top Doctor by 5280 Magazine for Vascular & Interventional Radiology. Honored 14 times since 2005.
Education
Medical School: Washington University School of Medicine – St. Louis, MO
Residency
Mallinckrodt Institute of Radiology, Barnes Hospital/St. Louis Children’s Hospital – St. Louis, MO
Fellowship
Vascular and Interventional Radiology: Mallinckrodt Institute of Radiology, Washington University of Medicine – St. Louis, MO
Board Certifications
American Board of Radiology 1996
Certificate of Added Qualifications in Vascular and Interventional Radiology 1998
Eric Malden, MD, FACR, is a highly respected board-certified vascular and interventional radiologist, holding the pivotal role of Chief of Interventional Radiology at RIA Endovascular. Dr. Malden is dedicated to providing exceptional care and innovation in interventional radiology.
Dr. Malden received his medical degree from the esteemed Washington University School of Medicine in St. Louis, Missouri. He soon embarked on a residency in diagnostic radiology at the Mallinckrodt Institute of Radiology, Barnes Hospital, and St. Louis Children’s Hospital, both part of Washington University.
Continuing his journey in the field, Dr. Malden completed a fellowship in vascular and interventional radiology at the Mallinckrodt Institute of Radiology. He holds board certifications from the American Board of Radiology and a Certificate of Added Qualifications (CAQs) in Vascular and Interventional Radiology.
With nearly 30 years of experience, Dr. Malden has received numerous awards and regional recognitions. In 2019, 5280 Magazine for Vascular & Interventional Radiology recognized Dr. Malden as one of Denver’s Top Doctors, an accolade he has won 14 times.
Dr. Malden’s areas of interest encompass complex hepatobiliary interventions, portal venous interventions, and urologic stone procedures. His commitment to patient care and innovative procedures ensures that patients receive the highest level of expertise, leading to improved outcomes and a better quality of life.
University of Cincinnati College of Medicine – Cincinnati, OH
Fellowship
Mallinckrodt Institute of Radiology – St. Louis, Missouri
Board Certification
American Board of Radiology – Diagnostic Radiology Board Certification American Board of Radiology – Interventional Radiology Board Certification
Awards
Galen Award for Academic Excellence in the Anatomical Sciences, Wright State University 2002
Brian Ravert, MD, practices as a vascular and interventional radiologist with RIA Endovascular in Greenwood Village and Windsor, Colorado.
After studying physics during undergrad, Dr. Ravert graduated from The Ohio State University College of Medicine in Columbus, Ohio. With a focus on the intellectual challenges and patient service potential of medicine, Dr. Ravert interned in internal medicine at Riverside Methodist Hospital, also located in Columbus, Ohio. He then completed his residency at the University of Cincinnati College of Medicine.
Dr. Ravert completed a fellowship at the Mallinckrodt Institute of Radiology in St. Louis, Missouri. He is board-certified by the American Board of Radiology in diagnostic radiology and interventional radiology. He received the Galen Award for Academic Excellence in the Anatomical Sciences from Wright State University.
In his practice as an interventional radiologist, Dr. Ravert focuses on analytical and procedural techniques, as well as the importance of direct patient contact and high-quality patient care.
Outside of work, Dr. Ravert spends time with his family, reads, and unwinds by playing the guitar.
