Who invented the first modern clock?
Thomas Alva Edison
Levi Hutchins of Concord, New Hampshire, invented an alarm clock in 1787. His alarm clock, however, rang at only one time-4 a.m. He invented this device so that he would never sleep past his usual waking time. He never patented or manufactured it. The first modern alarm clock was made by Antoine Redier (1817-1892) in 1847. It was a mechanical device; the electric alarm clock was not invented until around 1890. The earliest mechanical clock…
Actually the clock was invented by a bunch of people. The ancients created the sundial which was the first instrument to measure time. The guy you're thinking of is Eli Terry, who in 1797 received his first patent for a clock. He is known as the founder of the American clock-making industry. You can find more info on Wikipedia.