Seales was a product of the Tacoma Boys Club amateur boxing program,[1] and was coached by Joe Clough.

After losing to European champion Alan Minter in 1976, Seales remained on the outskirts of contention, until a first-round technical knockout at the hands of Hagler effectively ended his title hopes.

In 1980, Seales injured his left eye in a fight with Jaime Thomas, and retired due to a serious retinal tear.

He was subsequently declared legally blind, and was used as a cause célèbre along with Sugar Ray Leonard during the 1980s for those pushing for a ban on boxing.

Seales later worked as a schoolteacher of autistic students at Lincoln High School in Tacoma for 17 years, retiring in 2004.