Leonard Maltin
Leonard Michael Maltin (born December 18, 1950) is an American film critic and film historian, as well as an author of several mainstream books on cinema, focusing on nostalgic, celebratory narratives. He is best known for his eponymous annual book of movie capsule reviews, Leonard Maltin's Movie Guide, which was published annually from 1969 to 2014. Description above from the Wikipedia article Leonard Maltin, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known for
NOTFILM 
Going Attractions: The Definitive Story of the Movie Palace 
Making Apes: The Artists Who Changed Film 
The True Adventures of Raoul Walsh 
Temple of Film: 100 Years of the Egyptian Theatre 
Max Steiner: Maestro of Movie Music 
Adventure Thru the Walt Disney Archives 
The Marx Brothers: Hollywood's Kings of Chaos 
Splice Here: A Projected Odyssey