Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.
The life and career of "Apple" co-founder Steve Jobs was marked by three product introductions that revolutionized the computer industry: the launch of the legendary "Macintosh," the NeXT, and the iMac.
