Quinney made a strong start in his rookie season, earning four top-ten finishes in his first five events. This run of good form propelled him into the top 100 of the Official World Golf Rankings.
In May 2008 he reached the top 50 of the world rankings after finishing third at The Players Championship.
Quinney was named the assistant coach of the University of Oregon men's golf team in 2021. He became the school's interim head coach in October after Casey Martin had his leg amputated.