Question: Charles Shyer and George Tzavellas, have which mutual occupations?

Documents:
source: George Tzavellas
text: George Tzavellas George Tzavellas, also rendered Giorgos Tzavellas, Yiorgos Tzavellas, or Yorgos Javellas (Greek: Γιώργος Τζαβέλλας , 1916, Athens – October 18, 1976), was a Greek film director, screenwriter, and playwright. His filmmaking was particularly influential, with critic Georges Sadoul considering him "one of the three major postwar Greek directors" (along with Michael Cacoyannis and Nikos Koundouros).

source: Charles Shyer
text: Charles Shyer Charles Richard Shyer (born October 11, 1941) is an American film director, screenwriter and producer. Shyer's films are predominantly comedies, often with a romantic-comedy overtone. His films include "Private Benjamin" (1980); "Irreconcilable Differences" (1984); "Baby Boom" (1987); "Father of the Bride" (1991); and "Father of the Bride Part II" (1995), "The Parent Trap" (1998), "The Affair of the Necklace" ("L'Affaire du Collier") (2001), "Alfie" (2004) and "Ieri, Oggi Domani (Yesterday, Today and Tomorrow)" (2012).

source: I Love Trouble (1994 film)
text: I Love Trouble (1994 film) I Love Trouble is a 1994 American romantic comedy film starring Julia Roberts and Nick Nolte. It was written and produced by the husband-and-wife team of Nancy Meyers and Charles Shyer, and directed by Shyer.

source: Applause (1944 film)
text: Applause (1944 film) Applause (Greek: Χειροκροτήματα ) is a 1944 Greek drama film directed by George Tzavellas.

source: The Drunkard (1950 film)
text: The Drunkard (1950 film) The Drunkard (Greek: Ο μεθύστακας ), is a 1950 Greek drama film written and directed by George Tzavellas. It was the highest grossing Greek film in 1950, selling 304,438 tickets.

source: Marinos Kontaras
text: Marinos Kontaras Marinos Kontaras (Greek: Μαρίνος Κοντάρας ), also known as "The Corsair of the Aegean", is a 1948 Greek film written and directed by George Tzavellas, adapted from a short story of Argyris Eftaliotis. It was the first Greek film to be selected in an international festival (Experimental Film festival of Knokke-Heist).

source: We Have Only One Life
text: We Have Only One Life We Have Only One Life (Greek: Μια ζωή την έχουμε ) is a 1958 Greek comedy film directed by George Tzavellas.

source: The Affair of the Necklace
text: The Affair of the Necklace The Affair of the Necklace is a 2001 American historical drama film directed by Charles Shyer. The screenplay by John Sweet is based on what became known as the Affair of the Diamond Necklace, an incident that helped fuel the French populace's disillusionment with the monarchy and, among other causes, eventually led to the French Revolution. The film received negative reviews from critics, but the sets, music and costume design were widely praised.

source: Baby Boom (film)
text: Baby Boom (film) Baby Boom is a 1987 romantic comedy film directed by Charles Shyer, written by Nancy Meyers and Shyer, and produced by Meyers and Bruce A. Block for United Artists. It stars Diane Keaton as a yuppie who discovers that a long-lost cousin has died, leaving her a six-month-old baby girl as inheritance.

source: Alfie (2004 film)
text: Alfie (2004 film) Alfie is a 2004 British-American romantic comedy-drama film based on the 1966 British film of the same name, starring Jude Law as the title character, originally played by Michael Caine. The film was written, directed, and produced by Charles Shyer.

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Answer: film director, screenwriter