he played liz and petes boss on 30 rock
List of 30 Rock characters John Francis "Jack" Donaghy (Alec Baldwin) is the decisive, controlling, suave network executive who must deal with (and/or causes) unusual events at TGS. He is an Irish-American Catholic and a Republican. Donaghy is portrayed as a slick, brilliant and scrupulous network executive who directs many overtly backhanded compliments to Liz. Lemon (as he refers to her) and Donaghy have a work spouse relationship. Jack was married two times (and engaged two other times), and with his second wife, television reporter Avery Jessup, he has a daughter, Liddy Elizabeth Donaghy, named after Liz Lemon. Avery and Jack were divorced after her return from North Korea (where she was held hostage by Kim Jong Il) when they admit they only married because of Avery's pregnancy. Shortly after becoming the CEO of Kabletown, Jack suffered an emotional crisis and resigned, only to return to General Electric.