Quinney was born in Eugene, Oregon.

Quinney had a successful amateur career, winning the U.S. Amateur in 2000,^[2] and represented the USA in the Walker Cup in 2001.

After turning professional in 2001 he played on the Canadian Tour and Nationwide Tour, and won the Oregon Classic in 2004. He finished in the top 10 of the Nationwide Tour Order of Merit in 2006, enabling him to play on the PGA Tour in 2007.

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.

• 1998 Pacific Northwest Amateur
• 2000 U.S. Amateur, Pacific Northwest Amateur

No.	Date	Tournament	Winning score	To par	Margin of victory	Runner-up
1	Sep 19, 2004	Oregon Classic	71-71-70-63=275	−13	3 strokes	Barry Cheesman

Nationwide Tour playoff record (0–1)

No.	Year	Tournament	Opponent	Result
1	2006	Scholarship America Showdown	Brandt Snedeker	Lost to birdie on third extra hole

No.	Date	Tournament	Winning score	To par	Margin of victory	Runner(s)-up
1	Mar 31, 2002	Scottsdale Swing at McCormick Ranch	63-68-66-68=265	−23	6 strokes	James Driscoll
2	Jun 2, 2002	Bay Mills Open	69-74-69-70=282	−6	1 stroke	Dave Christensen, Mario Tiziani

CUT = missed the half-way cut
"T" = tied

CUT = missed the halfway cut
"T" indicates a tie for a place

Amateur

• Eisenhower Trophy: 2000 (winners)
• Palmer Cup: 2001 (winners)
• Walker Cup: 2001

• 2006 Nationwide Tour graduates