Known by the stage name O.S.T.R., he is a rapper and record producer known for his freestyle skills. Since his debut, he has released several #1 albums including Ja tu tylko sprzątam, Tylko dla dorosłych, and Życie po śmierci.
After completing a formal education in music, he self-released his debut album Saturator in 2000. A year later, he released his debut studio album Masz to jak w banku through Asfalt Records.
In 2013, he served as art director on the concert tour Męskie Granie alongside Kasia Nosowska
His parents are Barbara Ostrowska and Marek Ostrowski. He and his wife Natalia have two children, Nikodem and Jan.