Gene Siskel and Roger Ebert were two movie critics. In the 1960's both started their careers writing film reviews for newspapers. They got together in 1975 to do movie reviews on television. At the end of the year they compiled lists of their top movies for the year. All of the top lists Siskel and Ebert did while they were living are included. There are also lists for the film critics who filled in after Siskel's passing.
In 1998 AFI (American Film Institute) unveiled AFI's 100 Years ... 100 Movies which is a list of the 100 greatest American films of all times as determined by AFI.
In 2007 AFI announced AFI's 100 Years ... 100 Movies - 10th Anniversary Edition an updated list.