Question: Grant Heslov had an acting credit for the 1998 conspiracy film directed by whom?

Context paragraphs:
The Monuments Men: The Monuments Men is a 2014 war film directed by George Clooney, and written and produced by Clooney and Grant Heslov.  The film stars an ensemble cast including Clooney, Matt Damon, Bill Murray, John Goodman, Jean Dujardin, Bob Balaban, Hugh Bonneville, and Cate Blanchett.  It is loosely based on the non-fiction book "The Monuments Men: Allied Heroes, Nazi Thieves and the Greatest Treasure Hunt in History" by Robert M. Edsel and Bret Witter.  The film follows an Allied group from the Monuments, Fine Arts, and Archives program that is given the task of finding and saving pieces of art and other culturally important items before Nazis destroy or steal them, during World War II.

The Ides of March (film): The Ides of March is a 2011 American political drama film directed by George Clooney from a screenplay written by Clooney, along with Grant Heslov and Beau Willimon.  The film is an adaptation of Willimon's 2008 play "Farragut North".  It stars Ryan Gosling, George Clooney, Evan Rachel Wood, Philip Seymour Hoffman, Marisa Tomei, Paul Giamatti, and Jeffrey Wright.

Grant Heslov: Grant Heslov (born May 15, 1963) is an American actor, film producer, screenwriter and director, known for his producing and writing collaborations with George Clooney, which have earned him three Academy Award nominations.  As a co-producer of "Argo" (2012), he received the Academy Award for Best Picture in 2013.  As an actor, he has appeared in films including "True Lies" (1994), "Black Sheep" (1996), "Enemy of the State" (1998) and "The Scorpion King" (2002), as well as performing supporting roles in several films made with Clooney.

Suburbicon: Suburbicon is a 2017 American crime comedy film directed by George Clooney and written by Joel Coen, Ethan Coen, Clooney and Grant Heslov.  The film stars Matt Damon, Julianne Moore and Oscar Isaac.  It was screened in the main competition section of the 74th Venice International Film Festival and premiered on September 2, 2017.  It was also screened at the 2017 Toronto International Film Festival, and is scheduled to be released in the United States on October 27, 2017.

Dante's Peak: Dante's Peak is a 1997 American dramatic disaster thriller film directed by Roger Donaldson.  Starring Pierce Brosnan, Linda Hamilton, Charles Hallahan, Elizabeth Hoffman, Jamie Renée Smith, Jeremy Foley and Grant Heslov, the film was set in the fictional town of Dante's Peak where the inhabitants must survive a volcanic eruption and the resultant dangers.  It was released on February 7, 1997 under the production of Sony Pictures, Universal Pictures and Pacific Western Productions.

The Scorpion King: The Scorpion King is a 2002 American historical fantasy film directed by Chuck Russell, starring Dwayne "The Rock" Johnson, Kelly Hu, Grant Heslov, and Michael Clarke Duncan.  It is a spin-off from "The Mummy" franchise, which takes place before "The Mummy Returns" and follows the story of Mathayus and his rise to become the Scorpion King.

The Men Who Stare at Goats (film): The Men Who Stare at Goats is a 2009 British-American war parody comedy film directed by Grant Heslov.  It is a fictionalized version of Jon Ronson's 2004 book of an investigation into attempts by the U.S. military to employ psychic powers as a weapon.  The film stars George Clooney, Ewan McGregor, Jeff Bridges and Kevin Spacey, and was produced by Clooney's and Heslov's production company Smokehouse Pictures.

Enemy of the State (film): Enemy of the State is a 1998 American conspiracy-thriller film directed by Tony Scott, produced by Jerry Bruckheimer, and written by David Marconi.  The film stars Will Smith and Gene Hackman, with Jon Voight, Lisa Bonet, Gabriel Byrne, Loren Dean, Jake Busey, Barry Pepper, and Regina King in supporting roles.  The film tells the story of a group of NSA agents conspiring to kill a Congressman and the cover up that ensues after a tape of the murder is discovered.

Good Night, and Good Luck: Good Night, and Good Luck is a 2005 American historical drama film directed by George Clooney and starring David Strathairn, George Clooney, Robert Downey, Jr., Patricia Clarkson and Jeff Daniels.  The movie was written by Clooney and Grant Heslov (both of whom also have acting roles in the film) and portrays the conflict between veteran radio and television journalist Edward R. Murrow and U.S. Senator Joseph McCarthy of Wisconsin, especially relating to the anti-Communist Senator's actions with the Senate Permanent Subcommittee on Investigations.

Gary Martin (actor): Gary Martin (born Gary David Grant, 18 June 1958 in Ealing, London) is a British voice actor and actor who has been in the acting industry since the early 1980s.  His first recorded acting credit is as a chauffeur in the television series "Nobody's Perfect".  He has since gone on to perform in over 60 roles, either as a voice actor or actor.  Martin is well known for his vocal range, and has recorded voiceovers for multiple American and British commercials and film trailers.

Supporting paragraphs: Grant Heslov Enemy of the State (film)
Answer: Tony Scott