Question: Who directed the film to which "Tarzan II" is a followup?

Context paragraphs:
Tarzan and the Mermaids: Tarzan and the Mermaids is a 1948 adventure film based on the Tarzan character created by Edgar Rice Burroughs.  Directed by Robert Florey, it was the last of twelve Tarzan movies to star Johnny Weissmuller in the title role.  It was also the first Tarzan film since 1939 not to feature the character Boy, adopted son of Tarzan and Jane.  (Boy was described in the film as being away at school, and the character never returned to the series.)

Tarzan's Three Challenges: Tarzan's Three Challenges (1963) is a British-American adventure film filmed in Metrocolor, which is a followup to 1962's "Tarzan Goes to India".  The film was Jock Mahoney's second and final turn as the apeman, was produced by Sy Weintraub, written by Robert Day and Berne Giler, and directed by Robert Day.  The film was released in June 1963.

Tarzan (1999 film): Tarzan is a 1999 American animated drama adventure film produced by Walt Disney Feature Animation for Walt Disney Pictures.  The 37th Disney animated feature film and the last film produced during the Disney Renaissance era, it is based on the story "Tarzan of the Apes" by Edgar Rice Burroughs, and is the first animated major motion picture version of the "Tarzan" story.  Directed by Chris Buck and Kevin Lima with a screenplay by Tab Murphy, Bob Tzudiker, and Noni White, "Tarzan" features the voices of Tony Goldwyn, Minnie Driver, Glenn Close, and Rosie O'Donnell with Brian Blessed, Lance Henriksen, Wayne Knight, and Nigel Hawthorne.

Tarzan II: Tarzan II (also known as Tarzan II: The Legend Begins) is a 2005 direct-to-video animated film, a followup to the 1999 Walt Disney Feature Animation film "Tarzan".  It was released on June 14, 2005 on DVD and VHS.

Tarzan's New York Adventure: Tarzan's New York Adventure (also known as Tarzan Against the World ) is a 1942 film, the sixth Tarzan film to feature actors Johnny Weissmuller and Maureen O'Sullivan.  This film was the sixth and final film in MGM's "Tarzan" series and was the studio's last Tarzan film until their 1958 release, "Tarzan's Fight for Life", "Tarzan's New York Adventure" was directed by Richard Thorpe, and although it included New York scenes, as well as the customary jungle sequences, it was another Tarzan production primarily shot on MGM backlots.

Tarzan &amp; Jane: Tarzan & Jane is an animated comedy-adventure film produced by Walt Disney Television Animation, Toon City and Walt Disney Animation Australia released on July 23, 2002 and a direct-to-video sequel to the Disney's 1999 animated feature "Tarzan", and uses three unaired episodes of the film's corresponding television series, "The Legend of Tarzan". " Tarzan II", a followup to the original film, was released in 2005.  The film is set one year after the events of the first film.

Tarzan the Magnificent: Tarzan the Magnificent is a 1960 British film, the follow-up to "Tarzan's Greatest Adventure" (1959).  Its plot bears no relation to that of the 1939 Edgar Rice Burroughs novel of the same title.  The movie was directed by Robert Day and produced by Sy Weintraub and Harvey Hayutin.  Gordon Scott makes his last appearance as Tarzan while Jock Mahoney appeared as villain Coy Banton.  Mahoney would take over the Tarzan role himself beginning in the next film, "Tarzan Goes to India" in 1962.  This motion picture does not include Jane.

Tarzan the Ape Man (1932 film): Tarzan the Ape Man is a 1932 Pre-Code, American action adventure film featuring Edgar Rice Burroughs' famous jungle hero Tarzan and starring Johnny Weissmuller, Neil Hamilton, C. Aubrey Smith and Maureen O'Sullivan.  It was Weissmuller's first of 12 "Tarzan" films.  The film is loosely based on Burroughs' novel "Tarzan of the Apes" from approximately two decades earlier, with the dialogue written by Ivor Novello.  The film was directed by W. S. Van Dyke.  Metro-Goldwyn-Mayer released two remakes of "Tarzan, the Ape Man" in 1959 and in 1981, but each was a different adaptation of Rice Burroughs' novel.

Tarzan's Savage Fury: Tarzan's Savage Fury is a 1952 film starring Lex Barker as Tarzan, Dorothy Hart as Jane, and Patric Knowles.  The movie was directed by Cy Endfield.  While most Tarzan films of the 1930s, 1940s and 1950s presented Tarzan as a very different character from the one in Edgar Rice Burroughs' novels, this movie does make some allusions to the novels.  It was shot in Chatsworth, California's Iverson Ranch.  The film was the last to be directed by Cyril "Cy" Endfield in the US.  Finding himself one of Hollywood's film-makers blacklisted by the House Un-American Activities Committee he moved to Britain.  The film was co-written by Cyril Hume, who'd contributed substantially to the "Tarzan" series back in its bigger budget MGM days.

Tarzan's Deadly Silence: Tarzan's Deadly Silence (1970) is an adventure film composed of an edited two-part television episode of "Tarzan" released as a feature.  It stars Ron Ely as Tarzan.  Former Tarzan actor Jock Mahoney and Woody Strode (a veteran of two previous Tarzan films) co-star.  The movie was produced by Sy Weintraub and Leon Benson, written by Lee Erwin, Jack H. Robinson, John Considine, and Tim Considine (based on the character created by Edgar Rice Burroughs) and directed by Robert L. Friend.

Supporting paragraphs: Tarzan II Tarzan (1999 film)
Answer: Chris Buck and Kevin Lima