Harleen Quinzel (New Earth), DC Database

Dr. Harleen Quinzel, better known as Harley Quinn, is the former (and brief) girlfriend of the Joker. Since then, she's worked alone or with her friends Poison Ivy and Catwoman. Described as having a genius-level IQ, Harleen attended Gotham State University on a scholarship for gymnastics, where she majored in Psychiatry under Dr Odin Markus. To get into the graduate program, she had Dr. Markus meet with her in her dorm room, where she outlined what she believed would be a good graduate thesis

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Harleen Quinzel (Earth-508), DC Database