Poker After Dark is an hour-long poker television program on NBC. The show made its debut on January 1, 2007. For its first two seasons, both of which first aired in 2007, the show was presented by Shana Hiatt. The host for season 3 was Marianela Pereyra, and Leeann Tweeden took over starting with season 4. All seasons have contained voice-over commentary by Oliver "Ali" Nejad. On January 4, 2010, the show was broadcast in high definition for the first time.

Source: Wikipedia.org