Clarence "Kelly" Johnson was the lead engineer at Lockheed's famed "Skunk Works." Johnson, amongst other accomplishments, led Lockheed's development of the SR-71 Blackbird. He was also, at the request of the CIA, one of those responsible for construction of the airbase at Groom Lake, Nevada, later known as Area 51.
One of Lockheed's most famous aircraft, the U2, was flight tested at that facility. Interestingly, I used to work for a man who was a U2 test pilot. But that's another story for another time.
Johnson's most enduring legacy, in spite of his many aeronautical accomplishments, might be the acronym and phrase he coined: KISS, or "Keep it simple stupid." READ MORE?
(Link contains 18+ NSFW pic)