Leno is one of a handful of high-profile guest stars appearing in the first season of Shifting Gears, joining Jenna Elfman, who has a recurring role, and Allen’s Last Man Standing co-star Nancy Travis ...

The Tonight Show debuted in 1954 as Tonight and was hosted by Steve Allen until 1957. Jack Parr took over until 1962, followed by Johnny Carson until his retirement in 1992. Jay Leno filled Carson ...