Career
Stack, a 6 ft 11 in (211 cm) forward/center from the University of South Carolina, was selected by the Cleveland Cavaliers in the second round (48th overall) of the 1998 National Basketball Association Draft. He saw limited playing time in two seasons with the Cavaliers, as the backup to All-Star center Žydrūnas Ilgauskas. After playing in just 43 games for the Cavaliers, Stack signed a contract to play in Europe, and played for Gijón team from Spain"s ACB for the 2000-2001 season.
The next season Stack moved to Israel, and was signed by the Maccabi Ramat Gan team
After the year in Israel, he moved to Greece and was signed by Aris Thessaloniki, and played there from 2002 to 2006. He was then the highest paid center in Europe.
Stack was signed by Olympiacos in August 2006, for whom he played one season. He then signed with the Ukrainian league team BK Kyiv.
While playing for Aris Thessaloniki, Stack adopted the citizenship of Former Yugoslavian Republic of Macedonia.
That way he could play as a European on a Bosman passport, and thus not count as one of the two non-Europeans that were allowed per team in the Greek League at that time. He played for Former Yugoslavian Republic of Macedonia in several European and world championship qualifications.