Greuner is an award winning cardiovascular surgeon, inventor of No Knife Endovenous Ablation - the scar-less procedure for vein repair, and the first American surgeon to surgically treat lipedema. Greuner is the Co-Founder and Managing Director of NYC Surgical. He is also the Co-Founder and Medical Director of Centers for Special Surgery - Ambulatory Surgical Centers.
On a personal level, Dr. Greuner's significant other is Brazilian model Drielle Valaretto. In their spare time, the couple enjoys working out and leading a healthy lifestyle.