Dr. Nielsen Mark W. Nielsen, MD, FACS, RVT is a cardiothoracic and vascular surgeon specializing in the treatment of common vein disorders. Dr. Nielsen graduated summa cum laude from the University of North Dakota in 1978. He attended the University of North Dakota School of Medicine, graduating in 1983. He completed his general surgery residency in 1988 and was in private practice in rural North Dakota until 1991. He completed his cardiothoracic surgical training at the University of Kentucky in Lexington in 1994. During his training and subsequent private practice, Dr. Nielsen has performed more than 3,000 open heart procedures including heart and lung transplantation. He completed an endovascular fellowship in 2007 in Peoria, Illinois. He now has dedicated is practice entirely to the treatment of venous disease.

Dr. Nielsen is board certified by the American Board of Surgery and the American Board of Thoracic Surgery. He is a fellow of the American College of Surgeons (FACS) and a member of the Society of Thoracic Surgeons and the American College of Phlebology. Dr. Nielsen has also been awarded the credential of Registered Vascular Technologist (RVT) by the American Registry for Diagnostic Medical Sonography (ARDMS).

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What they say...

  • "My feet don't tingle anymore."
    ~Jeanie

  • "After standing at work all day, I am now able to play with the kids when I get home!"
    ~Shane

  • "My legs feel 20 years younger"
    ~Sally

  • "Thank you, Dr. Nielsen! My spider veins are gone."
    ~Kim