05/03/2026
Denys Overholser, the Lockheed engineer whose work made American stealth aircraft possible, has passed away at 87.
Lockheed Martin announced his death this week, calling him "a legendary Skunk Works engineer whose work helped shape the foundation of modern stealth."
His big moment came one April afternoon in 1975. He was 36 years old, working at Lockheed's secret Skunk Works division in Burbank, California. He walked into the office of his boss, Ben Rich, holding a translated science paper written by a Soviet physicist named Pyotr Ufimtsev.
That paper had been ignored in Russia and almost forgotten in America. But Overholser saw something nobody else did. The math inside it could be used to predict how radar waves bounce off an airplane.
In his own memoir, Ben Rich later called that moment "the Rosetta Stone breakthrough for stealth technology."
Overholser turned the math into a computer program called ECHO 1. With fellow engineer Bill Schroeder, he used it to design an airplane shaped like nothing anyone had ever seen, flat, sharp, and covered in angles. It looked so strange that Skunk Works founder Kelly Johnson nicknamed it the "Hopeless Diamond."
But it worked. When the team mounted a small model on a pole in the desert and aimed radar at it, the radar could not find the airplane. The pole was easier to spot than the model.
That design led to the Have Blue demonstrator in 1977, and then to the Lockheed F-117 Nighthawk, the world's first operational stealth aircraft.
During the 1991 Gulf War, F-117s flew over Baghdad, one of the most heavily defended cities on Earth at the time. Not a single one was shot down.
His work did not end there. According to Lockheed Martin, the same ideas he pioneered helped create the F-22 Raptor and the F-35 Lightning II, the fighter jets that protect American skies today.
Every American stealth aircraft flying right now owes something to the quiet engineer who walked into Ben Rich's office with a Soviet paper and an idea.
Rest in peace, Denys.