Knapp attended Covenant Christian High School in Indianapolis, Indiana, where he enrolled in 1997. He holds degrees in philosophy and political science from Indiana University–Purdue University Indianapolis.
In 2005, at the United Nations Sixtieth General Assembly, Knapp advocated for the Sahrawi people and spoke about the situation in Western Sahara. He has also been involved in community organizing for a Restore the Fourth rally in 2013.
Knapp has had several jobs, including delivering pizzas for the Indianapolis pizzeria Just Pizza, working at a grocery store, and working at a crisis hotline.
Justin Knapp publications indexed by Google Scholar
"Week in Wiki out: Hoosier is top contributor to online encyclopedia"