Late night TV hosts through the years

POSTED: 10:39 AM Apr 10 2014   UPDATED: 8:22 AM May 20 2015

As David Letterman signs off from the "Late Show" for the last time, take a look back at memorable late night hosts through the years.

1 / 20
NBC Television

Steve Allen -- "Tonight Starring Steve Allen" (September 1954-January 1957, NBC)