Donald Eugene Strandness (September 22, 1928 – January 7, 2002) was an American physician, university professor, and research scientist. Dr. Strandness, known as Gene, was influential in the development of Doppler ultrasound as a diagnostic tool in vascular medicine, and did research that established much of the clinical grading criteria in the field of vascular ultrasound. Dr. Strandness was recognized as a pioneer in the field of vascular surgery, and as a "founding father" of the University of Washington School of Medicine and Medical Center.