The number 10 pick in the 1964 NBA draft by the St. Louis Hawks out of Creighton, Silas wore number 29 for a good portion of his NBA career and is the best NBA athlete to wear that number.
Some of Silas' career NBA highlights from time spent with the Hawks, Suns, Celtics, Nuggets and SuperSonics are as follows:
- 12,357 rebounds
- 9.9 rebounds per game
- 3-time NBA Champion
- 11,782 points
- Named 5-times to NBA All-Defensive Team