Given the task definition and input, reply with output. In this task, you are given a set of context paragraph and some supporting facts to answer a question. Your task is to generate answer for given question based on set of context paragraphs and supporting facts.

Context_1 : A Family Affair is a musical with a book by James Goldman and William Goldman, lyrics by James Goldman and John Kander, and music by Kander. This was Kander's first show, and his only one written without Fred Ebb in Ebb's lifetime. Context_2 : Blue Rodeo is a made for television movie adapted from the novel by Jo-Ann Mapson. It first aired on CBS as a "Sunday night movie of the week" on October 20, 1996. "Blue Rodeo" was directed by Peter Werner and stars Ann-Margret and Kris Kristofferson. Context_3 : The Princess Bride is a 1987 American romantic fantasy adventure comedy-drama film directed and co-produced by Rob Reiner, and starring Cary Elwes, Robin Wright, Mandy Patinkin, Chris Sarandon, Wallace Shawn, Andre the Giant and Christopher Guest. Adapted by William Goldman from his 1973 novel of the same name, it tells the story of a farmhand named Westley, accompanied by befriended companions along the way, who must rescue his true love Princess Buttercup from the odious Prince Humperdinck. The story is presented in the film as a book being read by a grandfather (Peter Falk) to his sick grandson (Fred Savage), thus effectively preserving the novel's narrative style. Context_4 : Marathon Man is a 1974 conspiracy thriller novel by William Goldman. It was Goldman's most successful thriller novel, and his second suspense novel. Context_5 : Blood, Sweat and Stanley Poole is a 1961 play by William Goldman and James Goldman. Both Goldman brothers had served in the army and the play is about a supply sergeant at an army post in the south. Context_6 : A Cool, Dry Place is a 1998 drama movie adapted by Matthew McDuffie from the 1996 novel "Dance Real Slow" by Michael Grant Jaffe. It was directed by John N. Smith. The movie stars Vince Vaughn, Monica Potter, Joey Lauren Adams and Bobby Moat. Context_7 : Robert Reiner (born March 6, 1947) is an American actor, writer, director, producer, and activist. As an actor, Reiner first came to national prominence with the role of Michael Stivic on "All in the Family" (197179). That role earned him two Emmy Awards during the 1970s. As a director, Reiner was recognized by the Directors Guild of America (DGA) with nominations for the coming of age comedy-drama film "Stand by Me" (1986), the romantic comedy "When Harry Met Sally..." (1989), and the military courtroom drama "A Few Good Men" (1992). He also directed the psychological horror-thriller "Misery" (1990), the romantic comedy fantasy adventure "The Princess Bride" (1987) and the heavy metal mockumentary "This Is Spinal Tap" (1984). Context_8 : Memoirs of an Invisible Man is a 1992 American comedy science fiction film directed by John Carpenter and released by Warner Bros., with many scenes taking place in and around San Francisco. The film is loosely based on "Memoirs of an Invisible Man", a 1987 novel by H.F. Saint. According to William Goldman's book "Which Lie Did I Tell?", the film was initially developed for director Ivan Reitman; however, this version never came to fruition, due to disagreements between Reitman and Chevy Chase. The director deviated from his usual practice of titling the film as "John Carpenter's" because he knew that Warner Brothers would not allow him full artistic control, saying that the studio "is in the business of making audience-friendly, non-challenging movies." Context_9 : The Temple of Gold is a 1957 novel by William Goldman. It was Goldman's first novel, and launched his career. Context_10 : Inigo Montoya is a fictional character in William Goldman's 1973 novel "The Princess Bride." In Rob Reiner's 1987 film adaptation, he was portrayed by Mandy Patinkin. In both the book and the movie, he was originally from Spain and resided in the fictional country of Florin. fact_1 : Robert Reiner (born March 6, 1947) is an American actor, writer, director, producer, and activist. fact_2 : Adapted by William Goldman from his 1973 novel of the same name, it tells the story of a farmhand named Westley, accompanied by befriended companions along the way, who must rescue his true love Princess Buttercup from the odious Prince Humperdinck. Question: What is the birthday of the director of the 1987 movie adapted from a novel by William Goldman?
March 6, 1947