What is the name of the man driving the car JFK was riding in the day he was assassinated?

Answer 1

Wow - never thought I'd find it:

"William Greer (Ireland, 1910 - North Carolina, February 23, 1985) was an agent of the U.S. Secret Service, and drove President John F. Kennedy's automobile in the motorcade through Dealey Plaza in Dallas on November 22, 1963, when the President was assassinated. He can be seen in several pictures of the Kennedy family, including shadowing the family around the Easter holidays, 1962.

Answer 2

As my research recalls that the driver has multiple names. The government won't really reveal the true name of the driver, but the driver is an American government agent.