His June 2007 performance in Indianapolis included a jump of 8.22 meters (26 feet 11.75 inches), his personal best until the 2008 Olympic trials in Eugene, Oregon. There, he jumped 8.36 meters (27 feet 5.25 inches) in his third jump, setting a new lifetime personal best.[1] He competed at the 2008 Olympic Games without reaching the final.[2]
Quinley attended Merrill F. West High School in Tracy, California and won the CIF California State Meet Long Jump Championships in 2001.[4] Quinley is a 2001 long jump CIF California State Meet champion as a senior 7.47 m (24 ft 6 in), state finalist in the 300m hurdles, section champion in the long jump and runner-up in the 110m and 300m hurdles. Quinley is a league champion in the long jump and both hurdle races.