Dr. Ho Yinsen is a Stark medical tech specialist.
Yinsen was the doctor who saved Tony after the plane crash. In the new episode The Invincible Iron Man Part 2: Reborn, Yinsen came just in time to save Tony Stark's life once again. He appears to be more intelligent than the other doctors in the hospital, proven by him having created Tony's artificial heart.
Andros Stark later shows Tony Stark a solid-light image of Dr. Yinsen and Howard Stark creating the first heart monitor, which was years before Tony was born.