Question: The Emperor Waltz was directed by which Austrian-American filmmaker?

Context paragraphs:
Kaiser-Walzer: Kaiser-Walzer, Op. 437 (Emperor Waltz) is a waltz composed by Johann Strauss II in 1889.  The waltz was originally titled "Hand in Hand" and was intended as a toast made in August of that year by Austrian emperor Franz Joseph I on the occasion of his visit to the German Kaiser Wilhelm II where it was symbolic as a 'toast of friendship' extended by Austria to Germany.

Top o' the Morning / Emperor Waltz: Bing Crosby had recorded the songs from his film "Top o' the Morning" in May and June 1949 and these were released on two separate 78 records to tie in with the film’s premiere on August 31, 1949.  Following the development of the vinyl LP record by Columbia Records in 1948, Decca issued a plethora of Crosby albums in that format.  Many were simply reissues of earlier 78rpm albums but "Top o' the Morning / Emperor Waltz" appears to be the first 10" LP not to have been issued as a 78rpm album.  As the four songs from "Top o' the Morning" only filled one side of the LP, Decca added the four songs from the successful "Bing Crosby – The Emperor Waltz" 78 rpm album to complete the record.

Gile Steele: Gile Steele (24 September 1908 in Ohio – 16 January 1952 in Culver City, California), was a Hollywood costume designer.  His career began at MGM in 1938 with one of his first assignments being the Norma Shearer film "Marie Antoinette".  He also worked on many of the company's prestige pictures including "Pride and Prejudice" and "Boom Town" (both 1940), "Blossoms in the Dust" and "Dr. Jekyll and Mr. Hyde" (both 1941), "Mrs. Miniver" (1942) and "Madame Curie" (1943).  He was one of the first nominees when the category for Best Costume Design was introduced at the Academy Awards in 1948 for his work on "The Emperor Waltz".  He won the Oscar for "The Heiress" in 1949 and "Samson and Delilah" in 1950.  He died abruptly in 1952 at the age of 43.

Susi Graf: Susi Graf, is an Austrian-American filmmaker, currently living in New York.

Richard Haydn: George Richard Haydn (10 March 1905 – 25 April 1985), known as Richard Haydn, and born as George Richard Haydon, was an English comic actor in radio, films and television.  Some of his better known performances include "Ball of Fire" (1941) as Professor Oddley, "No Time for Love" (1943) as Roger, "And Then There Were None" (1945) as Thomas Rogers, "The Emperor Waltz" (1948), "Alice in Wonderland" (1951) as the Caterpillar, as Baron Popoff in "The Merry Widow" (1952), as William Brown in "Mutiny on the Bounty" (1962), and "The Sound of Music" (1965) as Max Detweiler.

Bing Crosby – The Emperor Waltz: Bing Crosby – The Emperor Waltz is an album of phonograph records by Bing Crosby of songs featured in his film "The Emperor Waltz".

The Emperor Waltz (1953 film): The Emperor Waltz (German: Kaiserwalzer) is a 1953 Austrian drama film directed by Franz Antel and starring Maria Holst, Rudolf Prack and Winnie Markus.  The film's sets were designed by Heinz Ockermüller and Sepp Rothaur.  It is set during the era of Empress Elisabeth of Austria.

The Emperor Waltz: The Emperor Waltz (German: "Ich küsse Ihre Hand, Madame" ) is a 1948 American musical film directed by Billy Wilder and starring Bing Crosby and Joan Fontaine.  Written by Wilder and Charles Brackett, the film is about a brash American gramophone salesman in Austria at the turn of the twentieth century who tries to convince Emperor Franz Joseph to buy a gramophone so the product will gain favor with the Austrian people.  "The Emperor Waltz" was inspired by a real-life incident involving Franz Joseph I of Austria.  Filmed on location in Jasper National Park in Canada, the film premiered in London, Los Angeles, and New York in the spring of 1948, and was officially released in the United States July 2, 1948.  In 1949, the film received Academy Award nominations for Best Costume Design and Best Music, as well as a Writers Guild of America Award nomination for Best Written American Musical.

Hans Heinz Theyer: Hans Heinz Theyer (August 5, 1910 – October 18, 1961) was an Austrian cinematographer.  He worked on around forty films, including "The Emperor Waltz" (1953).

Billy Wilder: Samuel "Billy" Wilder ( ; ] ; June 22, 1906March 27, 2002) was an Austrian-American filmmaker, screenwriter, producer, artist, and journalist whose career spanned more than five decades.  He is regarded as one of the most brilliant and versatile filmmakers of Hollywood's golden age.  With "The Apartment", Wilder became the first person to win Academy Awards as producer, director, and screenwriter for the same film.

Supporting paragraphs: The Emperor Waltz Billy Wilder
Answer: Samuel "Billy" Wilder