Ed Stefanski, the 76ers' president and general manager, began solidifying his front-office operation yesterday by extending the contracts of longtime executives Tony DiLeo and Courtney Witte.

Both received multiyear contract extensions. Details were not disclosed.

DiLeo, the team's senior vice president and assistant GM, is in his 19th season with the Sixers' basketball operations department. After spending four seasons as the team's director of player personnel, he was promoted to his current position in September 2003.

He supervises the team's draft effort along with the college and professional scouting systems.

During his tenure, DiLeo has been involved in every aspect of the team's basketball operations, including coaching, scouting and management.

Witte, the director of player personnel, is in his 11th season with the Sixers' basketball operations department, and 22d overall in the NBA. After serving as the team's director of scouting for two seasons, Witte was promoted to his current position in September 2003.

Witte joined the Sixers before the 1998-99 season as a video coordinator and scout after spending 11 seasons with the Indiana Pacers. He served as an assistant coach/director of scouting for the Sixers after a two-year stint as an assistant coach/head scout.

- Don McKee