Leszek Grądzki was born on August 4th, 1934 in Mońki, the child of Honorata (nee Świerzbińska) and Jan Grądzki. In 1944 along with his mother and siblings he moved to Białystok to Słonimska Street and the same year he began attending the 10th Primary School at Spacerowa Street. In 1946 he was moved the the Exercise School at Warszawska Street. He attended the Trade School at Warszawska Street. He was a weekend student at the Construction Technical High School. In the 50s he trained at the Związkowiec sports club at Słonimska Street. In 1960 he moved from Słonimska to Nowogródzka Street. He was a student at the Higher School of Engineering in Białystok, where he became a certified constructin technician. He worked at the “Przemysłówka” Białystok Construction for Industry Company and he ran his own construstion and renovation company.