Beibut was born on 19 August 1983 in Shymkent, Kazakhstan. When he was infant, Beibut was severely poisoned with milk and doctors told his parents that, due to a weakened immune system, their son would not be able to do heavy physical exercises. However, fortunately, the doctor’s prediction did not come true. At the age of 6 years, before attending the school, Beibut began doing sports.

Beibut fell in love with martial arts after watching numerous action movies with Bruce Lee. This inspired him, despite frequent illnesses as a child, to practice taekwondo, karate, wrestling, judo and boxing. Boxing has got him so much that it became the meaning of his life.

Beibut combined daily training in the gym with studying law and even worked as an assistant to local judge.

First major tournament in Beibut's boxing career took place in 2003 in India where he claimed silver medal at the inaugural African-Asian Games.

Beibut qualified to Olympic Games in Athens by winning 2004 Asian Boxing Championships in the Philippines. 

He defeated polish boxer Aleksy Kuziemski (37-22) in the first round, but broke his arm and dropped from the tournament. 

He had to leave boxing for 3 years because of the injury.

In 2007, Beibut and his brother Chingiz founded KZ Event Productions, Inc. promotion company in Las Vegas. The unique fact about this promotion company is that the US commission has given a license to Beibut Shumenov who is a foreign citizen.

The company objective is to help young and talented Kazakh boxers to develop professionally and personally inside and outside the ring not only in Kazakhstan, but all over the world.

KZ Event Productions, Inc. promotes show on major US television networks, including Showtime, ESPN, Fox Sports Network, NBC Sports, Comcast and in foreign networks in more than 100 countries. It also works together with major international promoters like Oscar De La Hoya and Golden Boy Promotions.

In 2007, Beibut started training in Las Vegas and made his professional debut.

His first fight took place on 17 November 2007 in North Carolina and Beibut knocked out debutant Walter Edwards in the first round. His second opponent was also knocked out in the first round. In March 2008, Beibut defeated experienced journeyman Shannon Miller by TKO.

The fourth fight in Beibut’s career was for the title. In the 12-round bout for WBC-ABCO and PABA Interim, he knocked out Donnell Wiggins in the second round.

Beibut returned to the ring for his next fight 12 days later and added WBO Asia Pacific title to his collection by knocking out experienced Lavell Finger inside one minute (26-2).

In August 2008 in Kazakhstan, Beibut faced the former world champion Montell Griffin. Montell’s list of victims includes Roy Jones Jr. and James Toney - Hall of Fame legends. But it didn’t scare Beibut and he easily defeated Montell with a crushing decision victory (49-8-0, 30 KO).

In December 2008 in the US, Beibut beat the Colombian Epifanio Mendoza (28-7-1, 24 KO) and significantly improved his place in the rankings.

Following his stunning victories, Beibut was named the Boxer of 2008 according to the WBC Asian Boxing Council.

In May 2009 in Shymkent, Beibut defeated former two-time WBA super middleweight champion Byron Mitchell by technical knockout (27-4-1). He defended his titles and won the IBA light heavyweight title.

On 15 August 2009 in Astana, Beibut faced Gabriel Campillo for the world champion title. Beibut had an 8-0 record prior to the fight. The Spaniard was declared the winner by majority decision. The result was quite controversial so it was decided to hold a rematch.

Second fight between Beibut and Gabriel took place on 29 January 2010 in the US. After 12 rounds Beibut won the bout. He became the first light heavyweight world champion to claim the title after 10 professional fights.

Beibut’s first defence of the WBA light heavyweight title was held on 23 July 2010 in Lemoore against Vyacheslav Uzelkov. The Ukrainian suffered first defeat in his professional career.

In 2011, Beibut was given the III-degree Barys award for global promotion of Kazakh culture. The nominees were personally selected by the President of Kazakhstan Nursultan Nazarbayev.

Beibut’s second title defense was held on 8 January 2011 in Shymkent against three-time world champion William Joppy (39-6-2). He knocked out American opponent early in the sixth round. Joppy was the fourth world champion beaten by Beibut during his professional career.

On 29 July 2011 in Las Vegas, Beibut knocked out American Danny Santiago (31-4-1). Year later he won the decision against Mexican Enrique Ornelas, despite the injury to his right forearm, which he did not tell about before the fight. This was Beibut Shumenov’s fourth title defense.

In October 2013, Beibut Shumenov was declared the WBA Super Champion.

On 14 December 2013 in San Antonio, Beibut made his debut in the Showtime Championship Boxing. He defeated Slovak Tomas Kovacs by technical knockout in the third round after knocking the opponent down in each round. It was the fifth defense of his WBA title.

On 19 April 2014, Beibut was unable to defend his WBA title (Super) against the IBF light heavyweight champion Bernard Hopkins. Beibut cited difficult weight cut as one of the reasons for poor performance.

After this fight, Beibut decides to move to cruiserweight.