This is a list of winners of the Academy Award for Performance by an Actor in a Leading Role, presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS) to an actor who has delivered an outstanding performance while working within the film industry.
 More popularly known as the Academy Award (or the Oscar) for Best Actor, this award was initially presented at the 1st Academy Awards ceremony for 1927–1928 and was most recently presented at the 88th Academy Awards ceremony for 2015.
 Throughout the past 88 years, accounting for ties and repeat winners, AMPAS has presented a total of 90 Best Actor awards to 79 actors.
 This list is current as of the 89th Academy Awards ceremony held on February 26, 2017.
This is a list of winners of the Academy Award of Merit for Performance by an Actor in a Supporting Role, presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS) to an actor who has delivered an outstanding performance while working within the film industry.
 More popularly known as the Academy Award (or the Oscar) for Best Supporting Actor, this award was initially presented at the 9th Academy Awards ceremony for 1936 and was most recently presented at the 88th Academy Awards ceremony for 2015.
 Throughout the past 80 years, accounting for ties and repeat winners, AMPAS has presented a total of 81 Best Supporting Actor awards to 73 different actors.
 This list is current as of the 89th Academy Awards ceremony held on February 26, 2017.
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.
Stephen Lawrence Schwartz (born March 6, 1948) is an American musical theatre lyricist and composer.
 In a career spanning over four decades, Schwartz has written such hit musicals as "Godspell" (1971), "Pippin" (1972) and "Wicked" (2003).
 He has contributed lyrics for a number of successful films, including "Pocahontas" (1995), "The Hunchback of Notre Dame" (1996), "The Prince of Egypt" (1998; music and lyrics) and "Enchanted" (2007).
 Schwartz has won the Drama Desk Award for Outstanding Lyrics, three Grammy Awards, three Academy Awards and has been nominated for six Tony Awards.
 He received the 2015 Isabelle Stevenson Award, a special Tony Award, for his commitment to serving artists and fostering new talent.
The 72nd Academy Awards ceremony, presented by the Academy of Motion Picture Arts and Sciences (AMPAS), honored films released in 1999 and took place on March 26, 2000, at the Shrine Auditorium in Los Angeles, beginning at 5:30 p.m. PST / 8:30 p.m. EST.
 During the ceremony, the AMPAS presented Academy Awards (commonly referred to as Oscars) in 23 categories.
 The ceremony, televised in the United States by ABC, was produced by husband-and-wife producing team Richard and Lili Fini Zanuck and was directed by Louis J. Horvitz.
 Actor Billy Crystal hosted the show for the seventh time.
 He first presided over the 62nd ceremony held in 1990 and had last hosted the 70th ceremony held in 1998.
 Three weeks earlier in a ceremony at the Regent Beverly Wilshire Hotel in Beverly Hills, California held on March 4, the Academy Awards for Technical Achievement were presented by host Salma Hayek.
American director, screenwriter, and producer Paul Thomas Anderson has directed seven feature-length films, five short films, twelve music videos, one documentary, one television episode as a guest segment director, and one theatrical play.
 He made his directorial debut with the mockumentary short film "The Dirk Diggler Story" (1988), at the age of 18, about a pornographic actor in the 1970s.
 Anderson followed it five years later with another short film, "Cigarettes & Coffee" in 1993.
 In 1996, Anderson wrote and directed the neo-noir crime thriller "Hard Eight", starring Philip Baker Hall, John C. Reilly, Gwyneth Paltrow, and Samuel L. Jackson.
 The film was well received, with film critic Roger Ebert saying of it in his review, "Movies like "Hard Eight" remind me of what original, compelling characters the movies can sometimes give us."
 Using the basis of "The Dirk Diggler Story", Anderson wrote and directed an expansion of the film entitled "Boogie Nights" in 1997.
 The film starred Mark Wahlberg as Eddie Adams/"Dirk Diggler" during the Golden Age of Porn in the 1970s and his eventual downfall in the 1980s.
 "Boogie Nights" received acclaim from critics and was a commercial success; at the 70th Academy Awards ceremony, the film was nominated for three Academy Awards, including for Best Supporting Actor (Burt Reynolds), Best Supporting Actress (Julianne Moore) and Best Original Screenplay.
Walter Andrew Brennan (July 25, 1894 – September 21, 1974) was an American actor.
 He won the Academy Award for Best Supporting Actor in 1936, 1938, and 1940, making him one of only three male actors to win three Academy Awards.
Sandy Powell OBE (born 7 April 1960) is a British costume designer.
 She has won three Academy Awards for Best Costume Design for "Shakespeare in Love" (1998), "The Aviator" (2004), and "The Young Victoria" (2009), and has been nominated 12 times for the award.
 She has also received 13 BAFTA Award nominations, winning for "Velvet Goldmine" and "The Young Victoria".
 She won many other awards in costume design for the latter film.
 Powell is often associated with Martin Scorsese and Todd Haynes, having designed the costumes for six of Scorsese's films and four of Haynes'.
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.
True-Life Adventures series is a collection of fourteen full length and short subject documentary films produced by Walt Disney Productions roughly between the years 1948 and 1960.
 The series won eight Academy Awards for the studio including three Academy Award for Best Documentary Feature awards for "The Living Desert", "The Vanishing Prairie" and "White Wilderness", and five Best Two Reel Live Action Short awards for "Seal Island", "In Beaver Valley", "Nature's Half Acre", "Water Birds", and "Bear Country".
 It inspired a daily panel comic strip that was distributed from 1955 to 1971 and drawn by George Wheeler.
 Several of the films were adapted in comic book format as one shots in the Dell Comics Four Color series.
 The films were among the earliest production experience for Roy E. Disney.
 Also this film series was the launching pad for Disney's new distributor, Buena Vista International.
 TV episodes are from Disney's anthology TV series.

Question: Which actor who won three Academy Awards acted in the 1998 conspiracy-thriller film Enemy of the State?
Answer: Grant Heslov