Piasecki was born in Tczew in the Pomeranian Voivodeship, Poland but moved to Norway with his family when he was two years old.

His father, Mariusz Piasecki is a fencing champion and coach[1][2][3] who won 12 medals at the Polish Championships, and represented Poland at international competitions in the epee.

[4] Bartosz Piasecki holds a bachelor's degree in computer science from the University of Oslo[5] He won the silver medal in the men's individual épée at the 2012 Summer Olympics in London.

[10] Bartosz Piasecki earned a bronze medal during the U23 European Fencing Championship in Debrecen in 2009.

[11] Piasecki's silver medal at the Olympics is Norway's best achievement in this discipline in history.