Kołsut debuted in Polish TV program Ziarno, when he was 7 years old; 5 years later he debuten in Polish dubbing.
He's best known roles in dubbing were: Michael Evers from The Haunted Mansion and Klaus from non-Disney movie Lemony Snicket's A Series of Unfortunate Events.
- Johnny Tsunami - Brett
- The Haunted Mansion - Michael Evers
- Dadnapped - Wheeze
- Wizards of Waverly Place: The Movie - Justin Russo