Knock on Wood is a 1954 comedy starring Danny Kaye and Mai Zetterling.
 Other actors in the film include Torin Thatcher, David Burns, and Leon Askin.
 The film was written and directed by Melvin Frank and Norman Panama, with songs by Kaye's wife, Sylvia Fine.
Melvin Frank (13 August 1913 in Chicago, Illinois – 13 October 1988 in Los Angeles, California) was an American screenwriter, film producer and film director.
 He is known for his work on films such as "Mr. Blandings Builds His Dream House" (1948), "The Court Jester" (1956), and "A Touch of Class" (1973).
Strange Bedfellows (1965) is an American comedy film directed by Melvin Frank, starring Rock Hudson, Gina Lollobrigida, Gig Young, and Terry-Thomas, and released by Universal Studios.
The Court Jester is a 1956 musical-comedy film starring Danny Kaye, Glynis Johns, Basil Rathbone, Angela Lansbury and Cecil Parker.
 The movie was co-written, co-directed, and co-produced by Melvin Frank and Norman Panama.
 The film was released by Paramount Pictures in Technicolor and in the VistaVision widescreen format.
The Reformer and the Redhead is a 1950 American romantic comedy film written, produced and directed by Norman Panama and Melvin Frank, and starring June Allyson and Dick Powell.
Our Hearts Were Growing Up is a 1946 American comedy film directed by William D. Russell and written by Melvin Frank, Norman Panama and Frank Waldman.
 It is the sequel to the 1944 film "Our Hearts Were Young and Gay".
 The film stars Gail Russell, Diana Lynn, Brian Donlevy, Billy De Wolfe, James Brown and Bill Edwards.
 The film was released on June 16, 1946, by Paramount Pictures.
The Duchess and the Dirtwater Fox is a 1976 American western romantic comedy film starring Goldie Hawn and George Segal, produced, directed and co-written by Melvin Frank.
Justin David Swibel (born April 1, 1983) is an American screenwriter, director, and producer.
That Certain Feeling is a 1956 American comedy film directed by Norman Panama and Melvin Frank, and starring Bob Hope, Eva Marie Saint, and George Sanders.
 The cast also features Pearl Bailey and a young Jerry Mathers.
Strictly Dishonorable is a 1951 romantic comedy film written, produced and directed by Melvin Frank and Norman Panama, and starring Ezio Pinza and Janet Leigh.
 It is the second film to be based on Preston Sturges' 1929 hit Broadway play of the same name after a pre-Code film released by Universal Pictures in 1931 with the same title.

Question: Are both Melvin Frank and Justin David Swibel a filmmaker?
Answer: yes