A 6’2’’ forward,[1] Klimkowski played basketball at Power Memorial Academy (class of 1967) as a teammate of Lew Alcindor.
[2] Collegiately Klimkowski played for the St. Bonaventure University men's basketball team[1] before transferring to C.W.
Under his guidance, Solna won the 1973 Swedish national championship[5] and subsequently played in the FIBA European Champions' Cup during the 1973–74 season.
In the first round of the European competition, his Solna team defeated English Epping Avenue BC Leyton, Klimkowski scored 30 points each in the home- and the away-game.
[9] In the 1980–81 season, he was head coach of Ferrarelle Rieti in Italy's top-tier Serie A and the Korać Cup.