Cory Ephram Joseph was born in 1991 in Pickering, Ontario, Canada, just east of Toronto. Cory is the son of Connie and David Joseph, who both played collegiate basketball for Mount Royal College. Joseph has two older sisters and one older brother. Joseph attended Pickering High School. He and his brother, Devoe, led Pickering's AAAA basketball team to back-to-back Ontario provincial championships in 2007 and 2008. Devoe went on to play basketball in college and in the Turkish Basketball First League. At age 16, Cory Joseph transferred to Findlay Prep in Henderson, Nevada with his friend and future NBA player Tristan Thompson. Future NBA guard Avery Bradley was also on the Findlay Prep squad. Findlay Prep, with Joseph, won the 2009 and 2010 ESPN RISE National School Invitational Championship. After their senior season, Joseph and Thompson both committed to the University of Texas. Joseph has frequently played on various Team Canada squads during FIBA competitions. During his professional career, Joseph was also named, in 2015, as captain of the Canadian national team. Fans can follow the guard on Twitter (@Cory_Joe) and Instagram (coryjoseph).