John H. Sinfelt was an American chemical engineer whose research on catalytic reforming  was responsible for the introduction of unleaded gasoline. He was born on February 18, 1931 in Pennsylvania, United States. Sinfelt worked for the Standard Oil Development Company, where he specialized in developing techniques to speed up chemical reactions. He later patented that method. In 1979, he received the National Medal Of Science. He died on May 28, 2011 in Morristown, New Jersey, United States.