Dr. Krajcer is an internationally recognized pioneer in his field and serves as the President of the International Society for Endovascular Specialists dedicated to the advancement of vascular and endovascular therapies.

Since 1996, Dr. Krajcer has participated as a co-investigator and principal investigator in many clinical trials for treatment of peripheral arterial disease, abdominal and thoracic aortic aneurysms and carotid artery stenosis including: Corvita AAA trial, Hemobahn Trial, AneuRx AAA Trial, AneuRx Thoracic trial, Wallgraft Trial, Carotid Wallstent Trial, Sapphire Carotid Stent Trial, BEECH Carotid Trial, Sapphire World Registry Trial, Archer Carotid Stent Trial, Choice Carotid stent Trial, Capture I & II Carotid Stent Trials, Endologix EVAR Trials, Valor I and Valor II Trial, Captivia Thoracic Trial, Captivia Acute Dissection Trial, and Excluder Original Design vs. Low Permeability Design study.