Question: Are Henry Koster and Johnnie To both film directors?

Context articles: The Great Opportunity
Bangladesh Film Directors Association
Johnnie To
Catherine the Last
The Affairs of Maupassant
Thea Roland
Das häßliche Mädchen
Henry Koster
Take Her, She's Mine
It Started with Eve

The Great Opportunity (German:Die große Gelegenheit) is a 1925 German silent film directed by Lorand von Kabdebo and starring Kurt Vespermann, Lia Eibenschütz and Colette Brettel.
 The production is notable as marking the filmmaking debut of Henry Koster, who co-wrote the screenplay.
 Koster would go on to become a top Hollywood film director.
Bangladesh Film Directors Association is the pan-national trade body of film directors in Bangladesh.
 The Bangladesh Film Directors Association’s General Secretary is Badiul Alam Khokon.
 Mushfiqur Rahman Gulzar is the president of Bangladesh Film Directors Association.
Johnnie To (born 22 April 1955), also known as To Kei-Fung (杜琪峯), is a Hong Kong film director and producer.
 Popular in his native Hong Kong, To has also found acclaim overseas.
 Intensely prolific, To has made films in a variety of genres, though in the West he is best known for his action and crime movies, which have earned him critical respect and a cult following (which include Quentin Tarantino, who once said that he really loves to watch To's gangster films).
Catherine the Last (German: Katharina, die Letzte) is a 1936 Austrian romantic comedy film directed by Henry Koster and starring Franciska Gaal, Hans Holt and Hans Olden.
 It was made by the Austrian subsidiary of Universal Pictures.
 After making the film Koster moved to Hollywood.
 In 1938 the film was remade in America as "The Girl Downstairs" with Gaal reprising her role.
The Affairs of Maupassant is a 1935 Austrian-Italian drama film production.
 The German title is "Das Tagebuch der Geliebten" and the Italian title is "Il diario di una donna amata", which means "the diary of a woman in love".
 An historical romance, it was directed by Henry Koster under his original name of Hermann Kosterlitz and starred Isa Miranda as the Ukrainian artist and diarist Marie Bashkirtseff and Hans Jaray as the French writer Guy de Maupassant.
 It was loosely based on Bashkirtseff's diaries, in which she records her studies in Paris to become an artist towards the end of the 19th century, and possibly on her correspondence with Maupassant, which she had begun under an assumed name.
 The film focuses on a feud between Maupassant and one of Bashkirtseff's teachers that leads to a nascent (and highly fictionalized) romance between Bashkirtseff and Maupassant.
 The romance is cut short in the film by Bashkirtseff's early death from tuberculosis.
 The film was made just before Koster moved to the United States to join Universal Studios.
 It was filmed in Vienna.
Thea Roland or The Adventure of Thea Roland (German: Das Abenteuer der Thea Roland) is a 1932 German comedy film directed by Henry Koster and starring Lil Dagover, Hans Rehmann and Margarete Kupfer.
 The film marked the directorial debut of Koster, who was forced to emigrate from Germany by the Nazi party following his next film and later went on to be a leading Hollywood director.
 Billy Wilder may have also worked on the screenplay, although he remained uncredited.
Das häßliche Mädchen ("The Ugly Girl", sometimes translated "The Ugly Duckling") is a German comedy film made in early 1933, during the transition from the Weimar Republic to Nazi Germany, and premièred in September that year.
 It was the first or second film directed by Hermann Kosterlitz, who left Germany before the film was completed and later worked in the United States under the name Henry Koster, and the last German film in which Dolly Haas appeared; she also later emigrated to the US.
 A riot broke out at the première to protest the male lead, Max Hansen, who was supposedly "too Jewish."
 The film's representation of the "ugly girl" as outsider has been described as a metaphorical way to explore the outsider existence of Jews.
Henry Koster (born Hermann Kosterlitz, May 1, 1905 – September 21, 1988) was a German-born film director.
 He was the husband of actress Peggy Moran.
Take Her, She's Mine is a 1963 comedy film starring James Stewart and Sandra Dee based on the 1961 Broadway comedy written by Henry Ephron and Phoebe Ephron.
 The film was directed by Henry Koster with a screenplay by Nunnally Johnson.
 It also features an early film score by prolific composer Jerry Goldsmith.
 The character of Mollie, played by Elizabeth Ashley on Broadway and in the film by Sandra Dee, was based on the then 22-year-old Nora Ephron.
 Ashley's performance won her a Tony Award for Best Featured Actress in a Play and served as the launchpad for her career.
It Started with Eve is a 1941 American musical romantic comedy film directed by Henry Koster and starring Deanna Durbin, Robert Cummings, and Charles Laughton.
 The film received an Academy Award nomination for Best Original Music Score (Charles Previn and Hans J. Salter).
 The film is considered by some critics to be Durbin's best film, and the last in which she worked with the producer (Joe Pasternak) and director (Henry Koster) that groomed her for stardom.
 "It Started with Eve" was remade in 1964 as "I'd Rather Be Rich".