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He is a current candidate for the Naismith Memorial Basketball Hall of Fame class of 2022. He is the Referee Development Performance Director for NBA Referee Operations, following a career as an NBA official from 1977 to 2016, officiating more than 2,500 regular season games and a record 344 playoff games. Fifty of those playoff games were in the Finals. In the all-time NBA referee rankings, he is first in playoff games, Finals Game 7s, and total games, plus he is tied for first in total seasons officiated. Along the way he also officiated three All-Star Games and even worked the McDonald's Championship in Germany in 1993. He is also in three Halls of Fame.