- Killed twelve students and one teacher with Dylan Klebold at Columbine High School.
- Was fluent in German.
- He had a history of severe anger problems and was ordered to attend anger management classes by a court after being arrested.
- Professor Aubrey Immelman published a personality profile of Harris, based on journal entries and personal communication. Immelman's profile believes the materials suggested behavior patterns consistent with a "malignant narcissism ... pathological narcissistic personality disorder with borderline and antisocial features, along with some paranoid traits, and unconstrained aggression".
- He had attempted to enlist in the United States Marine Corps but was rejected due to taking anti-depressants.
- He is said to have had anti-social personality disorder based on journals and videos recovered after the massacre.
- Designed, edited and ran his own website and Aol pages.
- Was scheduled to graduate from Columbine High School on May 23, 1999.
- He created the Harris levels for the interactive video game Doom.
- Moved to Littleton, Colorado from Plattsburgh, New York in July of 1993.
- Had an older brother named Kevin.
- It's believed by police that he was the one pushing for the massacre and was able to manipulate Klebold, who suffered from depression and sought validation, into joining him. Psychologists have cited the massacre as a good example of how a crime can be committed by a sociopathic perpetrator working with a non-sociopathic one.
- Was the son of Wayne Harris (a U.S. Airforce transport pilot) and Kathy Harris (a caterer).
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