Gene Siskel and Roger Ebert also give the city two thumbs up.

CNN: Midwestern Hollywood

Towards the end of the 1970s, Ebert teamed up with fellow critic Gene Siskel for their TV review show, where they would give films a thumbs up or thumbs down gesture.

BBC: Film critic Roger Ebert funeral held in Chicago

In 1975, he teamed up with Gene Siskel, of rival newspaper Chicago Tribune, to launch their movie show, which became famous throughout America for its "thumbs down" and "thumbs up" system of reviewing.

BBC: Roger Ebert, US film critic, recovers after hip fracture

Ebert, who originated At The Movies with fellow critic Gene Siskel in Chicago in 1975, left television in 2006 after multiple cancer surgeries resulted in the critic losing his jaw and his ability to eat, drink and speak.

FORBES: Roger Ebert Returns to Television

The heavy-set writer in the horn-rimmed glasses teamed up on television with Gene Siskel to create a format for criticism that proved enormously appealing in its simplicity: uncomplicated reviews that were both intelligent and accessible and didn't talk down to ordinary movie fans.

NPR: Ebert, Nation's Best-Known Film Critic, Dies At 70