Kerem Gonlum started his career in Ankara Sekerspor. He was transferred to TED Kolejliler in the 1997-1998 season. In the 1998-1999 season, he played in the A team and played in the 1st league. After playing at TED Ankara College for 2 years, he was going to Ülkerspor, where he would play for 6 years. Admired by Greg Popovich in the match played between the National Team and Dream Team in the summer of 2004, the player received a transfer offer from the San Antonio Spurs, one of the NBA teams, but the transfer did not take place as his club Ülkerspor did not let him go. One year after this development, he transferred to Anadolu Efes at the beginning of the 2005-2006 season.

He played 15 years in Euroleague, 242 games and was named "All-time rebounding top leaders" , he has 1199 rebounds. 

He played 178 games with Turkısh National team. 

Kerem Gonlum is one of the important players in the history of TBL and Euroleague. Since 1998, he has played in more than 500 games in the TBL and exceeded the threshold of 4000 points and 3000 rebounds.Kerem  is one of the important tall players of Turkish basketball with his defensive and rebounding ability.

2010 World Cup he played final with USA Dream Team.

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Career Milestones:
Silver medal in World Cup 2010
World no:6 in World Cup 2006
2 Turkish National League Champion
10 times Turkish Cup
8 Times President Cup
6 times All-Star Turkey
1 time Euroleague player of the week 
3 times MVP in Turkish Cup
2 Times Best-5 in Turkey National League
2 Time Best Turkish Player of the season