Crawford Hallock Greenewalt (16 August 1902 – 28 September 1993) was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 chemical engineer

Chemical engineer

In the field of engineering, a chemical engineer is the profession in which one works principally in the chemical industry to convert basic raw materials into a variety of products, and deals with the design and operation of plants and equipment to perform such work...

 who served as president of the DuPont Company from 1948 to 1962 and as board chairman from 1962 to 1967.
Greenewalt was born in Cummington, Massachusetts

Cummington, Massachusetts

Cummington is a town in Hampshire County, Massachusetts, United States. The population was 978 at the 2000 census. It is part of the Springfield, Massachusetts Metropolitan Statistical Area.- History :...

. In 1922 he earned a Bachelor of Science degree in chemical engineering from Massachusetts Institute of Technology

Massachusetts Institute of Technology

The Massachusetts Institute of Technology is a private research university located in Cambridge, Massachusetts. MIT has five schools and one college, containing a total of 32 academic departments, with a strong emphasis on scientific and technological education and research.Founded in 1861 in...

, where he joined Theta Chi

Theta Chi

Theta Chi Fraternity is an international college fraternity. It was founded on April 10, 1856 as the Theta Chi Society, at Norwich University, Norwich, Vermont, U.S., and was the 21st of the 71 North-American Interfraternity Conference men's fraternities.-Founding and early years at Norwich:Theta...

 Fraternity. He later became a Life Member of the MIT Corporation in 1951, and emeritus in 1977.

While at DuPont, Greenewalt was a key figure in their development of nylon

Nylon

Nylon is a generic designation for a family of synthetic polymers known generically as polyamides, first produced on February 28, 1935, by Wallace Carothers at DuPont's research facility at the DuPont Experimental Station...

 and their nuclear power

Nuclear power

Nuclear power is the use of sustained nuclear fission to generate heat and electricity. Nuclear power plants provide about 6% of the world's energy and 13–14% of the world's electricity, with the U.S., France, and Japan together accounting for about 50% of nuclear generated electricity...

 program.

His widely varied interests included ornithology

Ornithology

Ornithology is a branch of zoology that concerns the study of birds. Several aspects of ornithology differ from related disciplines, due partly to the high visibility and the aesthetic appeal of birds...

 and high-speed photography via his friend Harold E.