Joon Yun received his A.B. at Harvard and medical degree at Duke. After completing his residency and fellowship in radiology at Stanford, he remained on the clinical faculty at Stanford in the department of radiology through 2005. Joon has served on the board of medical companies, is the president of Palo Alto Investors and has authored over 30 patents. In addition, Joon founded the Palo Alto Institute, a non-profit think tank.