Also known as Ron Sobie, Sobieszczyk played for coach Ray Meyer at DePaul University from 1953 to 1956. He scored 1,222 points in his college career and participated with the College All-Stars team that toured with the Harlem Globetrotters. After college, he played four seasons in the NBA with the New York Knicks and Minneapolis Lakers, scoring 1,691 points before suffering a knee injury. He then served brief stints with the Washington Generals exhibition team and the Chicago Majors of the ABL.