Joyner attended Granby High School in Norfolk, Virginia, where averaged 15 points and 14 rebounds per game as senior.

[1] Joyner played college basketball for Stony Brook University's Seawolves, where he averaged 9 points and 6.6 rebounds as a senior.

Joyner helped Komárno to reach the 2014 Slovak League Semifinals, where they eventually were eliminated by Inter Bratislava.

[5] On March 14, 2017, Joyner recorded a double-double with a career-high 32 points and 16 rebounds, shooting 12-of-20 from the field, along with three assists and two steals in an 82–84 loss to Hapoel Haifa.

Joyner helped Kfar Saba to reach the League Playoffs as the eighth seed, where they eventually were eliminated by Maccabi Kiryat Gat in the Quarterfinals.

On September 20, 2018, Joyner signed a one-month contract with Hapoel Tel Aviv for the 2018–19 Champions League Qualifying rounds after impressing during their training camp.