Joseph Kittinger — born July 27, 1928 — was the first man to break the speed of sound. Video after the jump.
According to Kittinger, he broke the speed of sound during that famous highest jump. This may be debatable, as other references give his peak speed at 614 (988 km/h) or 618 (994 km/h) miles per hour, or mach 0.9. Nevertheless, he occasionally ribs Chuck Yeager about being the first man to break the speed of sound