A graduate of the studio of Professor Adam Myjak at the Sculpture Department of the Warsaw Academy of Fine Arts. Participant of the exhibition "COMING OUT - Best ASP Diplomas 2010". At the request of the Theater Academy A. Zelwerowicz, he made the gravestone of Zbigniew Zapasiewicz at the Powązki Military Cemetery in Warsaw. He is the initiator and co-author of numerous social projects implemented, among others as part of the Reaktor - Laboratorium Rzeźby group and the Rzeźba nad Wisłą project. In 2009-2012, he created book covers and illustrations for the Klin publishing house. Since 2016, he has been listed in the "Compass of the Young Art" ranking - a list of the most promising Polish artists according to Rzeczpospolita newspaper. Krzysztof Ostrzeszewicz participates in many exhibitions, his works are in numerous private collections.