Caddyshack is a 1980 American comedy film directed by Harold Ramis and written by Brian Doyle-Murray, Ramis and Douglas Kenney.
 It stars Michael O'Keefe, Chevy Chase, Rodney Dangerfield, Ted Knight, and Bill Murray.
 Doyle-Murray also has a supporting role.
 The film was later dedicated to producer Douglas Kenney, who died shortly after the film's release.
John O'Donnell (born 1962) is a long-standing member of the Australian music industry.
 Starting as a freelance writer, he eventually became the music editor of "Rolling Stone Australia" before leaving to co-found and edit "Juice Magazine".
Scott Colomby (born September 19, 1952) is an American film, television, and stage actor, best known for his roles in "Caddyshack" (1980) and "Porky's" (1982).
William James Murray (born September 21, 1950) is an American actor, comedian, and writer.
 He first gained exposure on "Saturday Night Live", a series of performances that earned him his first Emmy Award, and later starred in comedy films—including "Meatballs" (1979), "Caddyshack" (1980), "Stripes" (1981), "Tootsie" (1982), "Ghostbusters" (1984), "Scrooged" (1988), "Ghostbusters II" (1989), "What About Bob?
" (1991), and "Groundhog Day" (1993).
 He also co-directed "Quick Change" (1990).
Cecil Arthur Lewis {'1': ", '2': ", '3': ", '4': "} (29 March 1898 – 27 January 1997) was a British fighter pilot who flew in World War I.
 He went on to co-found the British Broadcasting Company and enjoy a long career as a writer, notably of the aviation classic "Sagittarius Rising" (some scenes from which were represented in the film "Aces High").
Michael O'Keefe (born Raymond Peter O'Keefe, Jr.; April 24, 1955) is an American film and television actor, known for his roles as Danny Noonan in "Caddyshack" and Ben Meechum in "The Great Santini" — for which he received a Golden Globe Award for New Star of the Year, as well as a nomination for the Academy Award for Best Supporting Actor.
Hamilton Mitchell (born August 13, 1957) is an American writer, author, and actor.
 First seen in the 1980 comedy "Caddyshack", Hamilton has been best known as Vice Principal Crubbs on the Nickelodeon series, "Ned's Declassified School Survival Guide", the Dad in THE CW Network's Worst Birthday Ever, and recurring as Historian Bill Haggerty on Parks and Recreation.
Douglas C. Kenney (December 10, 1946 – August 29, 1980) was an American writer and actor who co-founded the magazine "National Lampoon" in 1970.
 Kenney edited the magazine and wrote much of its early material.
Dennis Keith Bowen (September 9, 1950 – March 9, 2012) was an American character actor.
 His filmography included numerous films, more than one hundred television shows, and over one thousand television commercials during his career.
 Bowen's film credits included "Record City", "Van Nuys Blvd.", "Gas Pump Girls" and "Caddyshack II".
 His best-known television roles included the 1970s ABC television series, "Welcome Back, Kotter", in which he had a recurring role as Todd Ludlow.
Harold Allen Ramis (November 21, 1944 – February 24, 2014) was an American actor, director, writer, and comedian.
 His best-known film acting roles were as Egon Spengler in "Ghostbusters" (1984) and "Ghostbusters II" (1989) and Russell Ziskey in "Stripes" (1981); he also co-wrote those films.
 As a director, his films include the comedies "Caddyshack" (1980), "National Lampoon's Vacation" (1983), "Groundhog Day" (1993), and "Analyze This" (1999).
 Ramis was the original head writer of the television series "SCTV", on which he also performed, as well as a co-writer of "Groundhog Day" and "National Lampoon's Animal House" (1978).
 His final film that he wrote, produced, directed and acted in was "Year One" (2009).

Question: What magazine did the writer and actor, to whom the film "Caddyshack" was dedicated, co-found?
Answer: National Lampoon