He started his coaching career with a single season at his alma mater, Bishop Eustace, replacing his father in the role.

After two seasons with Magee, Lange moved on to Division I ball, going crosstown and earning an assistant coaching job at La Salle University in 1998.

While at La Salle, Lange helped the Explorers earn a 13–15 record during the 1998–99 season before being offered the head job at the United States Merchant Marine Academy in Kings Point, New York.

[5] Prior to joining Brett Brown's staff, Lange reportedly turned down a head coaching opportunity with the Rio Grande Valley Vipers, the NBA Development League, or D-League, affiliate of the Houston Rockets.

[6] While with the Sixers, Lange elevated into a lead assistant with roles that included player development and coordinating the team's offense.