Why is Scott Crossfield famous?

Scott Crossfield is famous for being a pioneering test pilot and a key figure in the early days of supersonic flight. He was the first person to fly at speeds greater than Mach 2 and is best known for his work with the Douglas D-558-2 Skyrocket and the North American X-15 program. His contributions to aviation significantly advanced aerospace technology and testing methods. Crossfield's legacy also includes his role in promoting aviation safety and education.