Inventor of the first fetal heart monitor who was the first doctor to successfully use penicillin in treatment.
His invention was borne out a desire to figure out a way to separate the baby's heartbeat from the mother's, which was impossible with a stethoscope.
Next to ultrasound, his fetal heart monitor is probably the most widely used device in delivery rooms.
He had two daughters with his wife, Carol Maurer.
Like Carl Wood, who perfected the IVF technique, Hess helped childbirth become easier and less dangerous.