Washington attended Sexton High School, where he was a four-year letter winner in basketball and track, receiving all-state recognition in both sports in 1993.

[5] In 2006, Washington joined longtime Oakland head coach Greg Kampe's basketball staff as an assistant.

[7][8] He was responsible for coaching the big men, including Moritz Wagner and D. J. Wilson whom both became NBA first-round picks.

In December 2020, Washington became the top ranked recruiter in the class of 2021 according to 247Sports Composite ranking for his involvement in the recruitment of five-star Michigan signees Moussa Diabaté and Caleb Houstan, along with four-star in-state Top100 Kobe Bufkin and Top100 point guard Frankie Collins.

Sidney competed two seasons at University of Pittsburgh Panthers as a member of their women's gymnastics team.