Dean Levine-Wilkins is a lawyer recruited by Diane Lockhart, introduced in season 6 episode 2, "Trust Issues." He originally moves to Chicago to join Lockhart/Gardner on Diane's en-treatment, but quickly learns she is leaving the firm. He confronts her after her "retirement" speech, and she reveals to him that she is jumping ship to Florrick/Agos, and suggests he join her. Although initially disenchanted by their offices and start-up vibe, he agrees, managing to bring along several department heads from Lockhart/Gardner.
Dean is portrayed as charismatic and gracious but admits he has lived his professional life always pursuing the sure thing, the safe route. Following Diane to Florrick/Agos is a major change for him, but also serves his own ambition and desire to finally take a risk.
In "Dear God," Dean reveals to Alicia he planned to become a priest after leaving high school but decided on law instead after reading "To Kill a Mockingbird."