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Marlin Stephen Heilman (born December 25, 1933) is an American physician, entrepreneur and inventor. Heilman, who holds more than 30 patents related to medical imaging, ICDs and cardiac assist devices, has also founded and run several medical device companies, including Medrad Inc., Medrad Intec, Lifecor, and Vascor.

Early life and education
Heilman was born on Christmas Day, 1933 in Tarentum, Pennsylvania. After graduating from the University of Pennsylvania with a Bachelor of Arts and chemistry major in 1955, he matriculated at the University of Pennsylvania School of Medicine. After graduating from medical school, he performed a general medical internship in 1960. He next joined the US Air Force to satisfy a deferred military service obligation and was stationed in Soesterberg, the Netherlands, where he spent two years as the Medical Officer in Charge of the 654th U.S. Airforce Tactical Hospital.

Early career
After finishing his tour of duty with the Air Force in the Netherlands, Heilman returned to working in US mainland emergency rooms. There, he decided that the industry needed a more effective contrast agent for use in heart xrays. In February 1964 he formed a new company to develop, produce and distribute angiographic products for hospitals. He named the new company Medrad, an acronym for medical research and development. During that year, he also started work on his first invention: the automatic flow-controlled angiographic power injector.

Implantable cardioverter defibrillator
One of the physicians with which Heilman worked a lot during the 1970s was Michel Mirowski. The two developed Mirowski's implantable cardioverter defibrillator (ICD) over a three year period. In 1980, the first ICD, provided by Medrad/Intec, was implanted in a patient at Johns Hopkins Hospital in Baltimore. In 1985, with U.S. FDA approval pending, Heilman and his coworkers sold Intec to Eli Lilly and Company for approximately 100 million dollars, which had first approached Heilman in 1984 to acquire the asset. Lilly placed the ICD technology with its pacemaker subsidiary CPI and subsequently merged CPI into the newly formed Guidant Corporation. To date, there have been well over a million ICD recipients, including former Vice-President of the United States, Dick Cheney. The group were inducted into the National Inventors Hall of Fame in 2002 for their work together.

Lifecor
In November 1986, Heilman, and Larry Bowling founded Lifecor, a company that has developed the world's first patient wearable cardioverter defibrillator. Each generation of its product has received FDA approval, and it is available in the US and Europe since 2001. The Lifecor business was acquired by ZOLL Medical Corporation in 2006, after forming a licensing relationship on 2004.

VASCOR
In 1986, Heilman also founded the Pittsburgh based company Vascor. Vascor has been engaged in the development of an implantable heart assist device but as yet has not produced a device for clinical use.

Boards
Heilman is a director of the West Penn Allegheny Health System.