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Harold Eugene "Doc" Edgerton, Sc.D. (April 6, 1903 – January 4, 1990) was a professor of electrical engineering at the Massachusetts Institute of Technology. He is largely credited with transforming the stroboscope from an obscure laboratory instrument into a common device seen in nearly every camera.

He grew up in Aurora, Nebraska and attended the University of Nebraska-Lincoln. After graduating, he married Esther Garret in 1928. During their marriage they had three children: William, Robert, and Mary Lou.

He earned an S.M. in electrical engineering from MIT in 1927. Edgerton used stroboscopes to study synchronous motors for his Sc.D. thesis in electrical engineering at MIT, awarded in 1931. He credited Charles Stark Draper with inspiring him to point stroboscopes at everyday objects: the first was a stream of water coming out of a faucet.

In 1937 he began a lifelong association with photographer Gjon Mili, who used stroboscopic equipment, particularly a "multiflash" strobe light, to produce strikingly beautiful photographs, many of which appeared in Life Magazine. Edgerton was a pioneer in strobe photography, subsequently using the technique to capture images of balloons during their bursting, or a bullet during its impact with an apple, for example. He was awarded a bronze medal by the Royal Photographic Society in 1934, and the National Medal of Science in 1973.

He was a cofounder of the company EG&G, with Kenneth Germeshausen and Herbert Grier, in 1947. EG&G became a prime contractor for the Atomic Energy Commission and had a major role in photographing and recording nuclear tests for the United States through the fifties and sixties. For this role he developed the Rapatronic camera, which was supplied by EG&G.

His work was instrumental in the development of side-scan sonar technology, used to scan the sea floor for wrecks. Edgerton worked with the undersea explorer Jacques Cousteau, by first providing him with underwater stroboscopes, and then by using sonar to discover the Britannic. Edgerton participated in the discovery of the American Civil War battleship USS Monitor. While working with Cousteau, he acquired the nickname he is still known by in photographic circles, "Papa Flash".

In addition to having the scientific and engineering acumen to perfect strobe lighting commercially, Edgerton is equally recognized for his visual aesthetic: many of the striking images he created in illuminating phenomena that occurred too fast for the naked eye adorn art museums worldwide.

He was especially loved by MIT students for his willingness to teach and his kindness: "The trick to education," he said, "is to teach people in such a way that they don't realize they're learning until it's too late." One of the graduate student dormitories at MIT carries his name.

Edgerton's work was featured in an October 1987 National Geographic Magazine article entitled, "Doc Edgerton: the man who made time stand still."

"Doc" Edgerton died January 4. 1990 at the age of 86. On July 3, 1990, in an effort to memorialize his accomplishments, several Aurora community members decided to construct a "Hands-On" science center. It was designated as a "teaching museum," that would preserve Doc's work and artifacts, as well as feature the "Explorit Zone" where people of all ages could participate in hands-on exhibits and interact with live science demonstrations. After five years of private and community-wide funding, as well as individual investments by Doc's surviving family members, the Edgerton Explorit Center was officially dedicated on September 9, 1995.

• Early photographs from Edgerton's laboratory, including water from the tap mentioned above
• Biographical timeline
• The Edgerton Center at MIT
• Selection of photographs by Edgerton. Victoria and Albert Museum. Retrieved on 2007-06-16.
• [*The Edgerton Explorit Center in Aurora, NE