His research foci included 20th Century Irish drama, post-colonial theaters, and theaters of social justice.
He has worked as a performer, dramaturg, educational outreach writer, and director with university, community, and professional theaters in Florida and Colorado and was part of the inaugural class for Naropa University's Actor-created Physical Theater program.
Prior to graduate school, while working as a freelance writer, Joyner co-created and wrote several titles for DC Comics including Hammerlocke,[1] Scarlett, and Damage.
His first published comics work was an Amazons feature which appeared as a DC Comics Bonus Book in Wonder Woman #26 (January 1989).
[2] Joyner also wrote individual issues of several other titles including Doctor Fate, Batman: Legends of the Dark Knight, Deathstroke, and Secret Origins.