Kristoffer Vassbakk Ajer is a Norwegian professional footballer who plays as a defender for Brentford in the Premier League and the Norway national team. Born on April 17, 1998, in Rælingen, Norway, Ajer began his career at IK Start before moving to Celtic in 2016, where he won multiple domestic titles. Known for his composure, versatility, and ability to play as a center-back or defensive midfielder, Ajer joined Brentford in 2021. He has been a key player for Norway, earning numerous caps since his debut in 2018.