Prior to joining the Defense Department in April 2022, he was a professor of political science at the University of Pennsylvania.

[3] He graduated from Emory in 2000 with a BA in political science, then earned a PhD in Government from Harvard University.

In 2013 he served as an International Affairs Fellow, funded by the Council on Foreign Relations, in the Office of the Undersecretary of Defense for Policy.

This award is given annually to an individual under the age of 40 who is judged to have made the most significant contribution to the study of international relations and peace research.

On February 25, 2020, Horowitz was appointed director of Perry World House, the University of Pennsylvania's Think Tank for Global Affairs.