Short answers, pulled from the story.
The Great Movies is a series of publications, both online and in print, in which the American film critic and Chicago Sun-Times columnist Roger Ebert wrote essays on films he considered particularly well-made, important, or influential.
Ebert described the goal as an effort to make a tour of the landmarks of the first century of cinema.
The Great Movies was published as four separate books: The Great Movies, The Great Movies II, The Great Movies III, and The Great Movies IV.
The first book, The Great Movies, was published in November 2003 by Three Rivers Press and ran 544 pages.
The Great Movies IV was published by the University of Chicago Press in September 2016 and ran 288 pages.
Yes, the publisher changed partway through the series. The Great Movies and The Great Movies II were published by Three Rivers Press in November 2003 and February 2006, while The Great Movies III and The Great Movies IV moved to the University of Chicago Press in October 2011 and September 2016.