Michael Gerard Tyson was born in Brownsville, Brooklyn, New York on June 30, 1966. He has an elder brother named Rodney (born c. 1961) and had an elder sister named Denise, who died of a heart attack at age 24 in February 1990. Tyson's biological father is listed as "Purcell Tyson" (who was from Jamaica) on his birth certificate, but the man Tyson had known as his father was Jimmy Kirkpatrick. Kirkpatrick was from Grier Town, North Carolina (a predominantly black neighborhood that was annexed by the city of Charlotte), where he was one of the neighborhood's top baseball players.

Tyson made his professional debut as an 18-year-old on March 6, 1985, in Albany, New York. He defeated Hector Mercedes via a first round knockout. He had 15 bouts in his first year as a professional. Fighting frequently, Tyson won 26 of his first 28 fights by KO or TKO; 16 of those came in the first round. The quality of his opponents gradually increased to journeyman fighters and borderline contenders, like James Tillis, David Jaco, Jesse Ferguson, Mitch Green and Marvis Frazier. His win streak attracted media attention and Tyson was billed as the next great heavyweight champion. D'Amato died in November 1985, relatively early into Tyson's professional career, and some speculate that his death was the catalyst to many of the troubles Tyson was to experience as his life and career progressed.  Tyson's first nationally televised bout took place on February 16, 1986, at Houston Field House in Troy, New York against journeyman heavyweight Jesse Ferguson. Tyson knocked down Ferguson with an uppercut in the fifth round that broke Ferguson's nose. During the sixth round, Ferguson began to hold and clinch Tyson in an apparent attempt to avoid further punishment. After admonishing Ferguson several times to obey his commands to box, the referee finally stopped the fight near the middle of the sixth round. The fight was initially ruled a win for Tyson by disqualification (DQ) of his opponent. The ruling was "adjusted" to a win by technical knockout (TKO) after Tyson's corner protested that a DQ win would end Tyson's string of knockout victories, and that a knockout would have been the inevitable result.  On November 22, 1986, Tyson was given his first title fight against Trevor Berbick for the World Boxing Council (WBC) heavyweight championship. Tyson won the title by second round TKO, and at the age of 20 years and 4 months became the youngest heavyweight champion in history. Tyson's dominant performance brought many accolades. Donald Saunders wrote: "The noble and manly art of boxing can at least cease worrying about its immediate future, now [that] it has discovered a heavyweight champion fit to stand alongside Dempsey, Tunney, Louis, Marciano and Ali."  Tyson intimidated fighters with his strength, combined with outstanding hand speed, accuracy, coordination and timing. Tyson also possessed notable defensive abilities, holding his hands high in the Peek-a-Boo style taught by his mentor Cus D'Amato to slip under and weave around his opponent's punches while timing his own. One of Tyson's trademark moves was a right hook to his opponent's body followed by a right uppercut to his opponent's chin. Lorenzo Boyd, Jesse Ferguson and Jose Ribalta were each knocked down by this combination.  Expectations for Tyson were extremely high, and he embarked on an ambitious campaign to fight all of the top heavyweights in the world. Tyson defended his title against James Smith on March 7, 1987, in Las Vegas, Nevada. He won by unanimous decision and added Smith's World Boxing Association (WBA) title to his existing belt. "Tyson-mania" in the media was becoming rampant. He beat Pinklon Thomas in May with a knockout in the sixth round. On August 1 he took the International Boxing Federation (IBF) title from Tony Tucker in a twelve round unanimous decision. He became the first heavyweight to own all three major belts - WBA, WBC, and IBF - at the same time. Another fight, in October of that year, ended with a victory for Tyson over 1984 Olympic super heavyweight gold medalist Tyrell Biggs by knockout in the seventh round.  During this time, Tyson came to the attention of gaming company Nintendo. After witnessing one of Tyson's fights, Nintendo of America president, Minoru Arakawa was impressed by the fighter's "power and skill", prompting him to suggest Tyson be included in the upcoming Nintendo Entertainment System port of the Punch Out!! arcade game. In 1987, Nintendo released Mike Tyson's Punch-Out!!, which was well received and sold more than a million copies.  Tyson had three fights in 1988. He faced Larry Holmes on January 22, 1988, and defeated the legendary former champion by a fourth round KO. This was the only knockout loss Holmes suffered in 75 professional bouts. In March, Tyson then fought contender Tony Tubbs in Tokyo, Japan, fitting in an easy two-round victory amid promotional and marketing work.  On June 27, 1988, Tyson faced Michael Spinks. Spinks, who had taken the heavyweight championship from Larry Holmes via a 15-round decision in 1985, had not lost his title in the ring but was not recognized as champion by the major boxing organizations. Holmes had previously given up all but the IBF title, and that was eventually stripped from Spinks after he elected to fight Gerry Cooney (winning by a 5th-round TKO) rather than IBF Number 1 Contender Tony Tucker, as the Cooney fight provided him a larger purse. However, Spinks did become the lineal champion by beating Holmes and many (including Ring magazine) considered him to have a legitimate claim to being the true heavyweight champion. The bout was, at the time, the richest fight in history and expectations were very high. Boxing pundits were predicting a titanic battle of styles, with Tyson's aggressive infighting conflicting with Spinks' skillful out-boxing and footwork. The fight ended after 91 seconds when Tyson knocked Spinks out in the first round; many consider this to be the pinnacle of Tyson's fame and boxing ability.  During this period, Tyson's problems outside the ring were also starting to emerge. His marriage to Robin Givens was heading for divorce, and his future contract was being fought over by Don King and Bill Cayton. In late 1988, Tyson parted with manager Bill Cayton and fired longtime trainer Kevin Rooney, the man many credit for honing Tyson's craft after the death of D'Amato. Following Rooney's departure, critics alleged that Tyson began to use the Peek-a-Boo style sporadically. Tyson insisted he hadn't altered the style that made him a world champion. In 1989, Tyson had only two fights amid personal turmoil. He faced the popular British boxer Frank Bruno in February. Bruno managed to stun Tyson at the end of the 1st round, although Tyson went on to knock out Bruno in the fifth round. Tyson then knocked out Carl "The Truth" Williams in one round in July.  By 1990, Tyson seemed to have lost direction, and his personal life was in disarray amidst reports of less vigorous training prior to the Buster Douglas match. In a fight on February 11, 1990, he lost the undisputed championship to Douglas in Tokyo. Tyson was a huge betting favorite; indeed, the Mirage, the only casino to put out odds for the fight, made Tyson a 42/1 favorite. However, Douglas was at an emotional peak after losing his mother to a stroke 23 days prior to the fight; Douglas fought the fight of his life. Contrary to reports that Tyson was out of shape, it has been noted at the time of the fight that he had pronounced muscles, an absence of body fat and weighed 220 and 1/2 pounds, only two pounds more than he had weighed when he beat Michael Spinks 20 months earlier. Mentally, however, Tyson was unprepared. He failed to find a way past Douglas's quick jab that had a 12-inch (30 cm) reach advantage over his own. Tyson did catch Douglas with an uppercut in the eighth round and knocked him to the floor, but Douglas recovered sufficiently to hand Tyson a heavy beating in the subsequent two rounds. (After the fight, the Tyson camp would complain that the count was slow and that Douglas had taken longer than ten seconds to get to his feet.) Just 35 seconds into the 10th round, Douglas unleashed a brutal uppercut, followed by a four-punch combination of hooks that sent Tyson to the canvas for the first time in his career. He was counted out by referee Octavio Meyran.  The knockout victory by Douglas over Tyson, the previously undefeated "baddest man on the planet" and arguably the most feared boxer in professional boxing at that time, has been described as one of the most shocking upsets in modern sports history.

Why was Tysons marriage failing?