Quinn Alexander Cook was born in Washington, D.C., to Ted and Janet Cook. He has one older sister, Kelsey. Cook played at DeMatha Catholic High School in Hyattsville, Maryland, during his freshman, sophomore and junior seasons. DeMatha finished as the No. 1 ranked team in the state of Maryland during Cook's junior season. Overall, the Stags had an 85-18 record during Cook's career at DeMatha. Following his junior season, Cook became the first junior in 30 years to be named the Washington Post All-Met Player of the Year. He was invited to play in the fifth annual Boost Mobile Elite 24 game prior to his senior season, joining future Duke teammates Austin Rivers, Alex Murphy, and Michael Gbinije in the game. Cook transferred to Oak Hill Academy in Mouth of Wilson, Virginia, for his senior season, during which he led the Warriors to a 31-4 record while averaging 19.1 points, 10.9 assists and 2.5 steals per contest. Following his senior season at Oak Hill Academy, Cook was named a Second Team All-American by Maxpreps and also participated in the 2011 McDonald's All-American Game. Quinn runs youth basketball camps in the summer. Learn more about Cook by following him on Twitter @QCook323 and on Instagram @qcook323. Cook began his four-year career at Duke as a backup point guard and closed it with a National Championship. The 6-foot-2 guard backed up Austin Rivers and Seth Curry as a freshman and played 11.7 minutes per game, posting 4.4 points and 1.9 assists per game in a limited role. Cook moved into the starting lineup as a sophomore and led the squad with 5.3 assists to go along with 11.7 points and 3.8 rebounds. He had a 14-assist game in a win over Wake Forest (despite going scoreless) and followed that game with a career-high 27 points against Clemson. In his junior season, Cook started 22 of 35 games and put up 11.6 points and 4.4 assists. He led the Blue Devils with 23 points in their first-round loss to Mercer in the NCAA Tournament. That loss fed a Duke run to the 2015 title. During his senior season, Cook averaged 15.3 points and connected on 39.5 percent of his three-point attempts. He scored 20 points in three consecutive games in February. In the Big Dance, Cook averaged 13.5 points and 4.0 rebounds. The guard also represented USA in FIBA competition in 2009 and 2010. After going undrafted in the 2015 NBA draft, Cook joined the Oklahoma City Thunder for that year's Orlando Summer League.