At Georgetown, he was executive editor of the school's International Law Journal.

[1][2][3][4][5] From 1977 to 1978, Deyo was an attorney at the New York City law firm Patterson, Belknap, Webb & Tyler.

He oversaw human resources, procurement, contributions, philanthropy, legal affairs and compliance.

[1] According to DHS, he oversaw "the Office of Corporate Secretary, Government Affairs and Policy, Privacy, Security and Aviation."

[1] He served as the Acting Deputy Secretary of Homeland Security from November 1, 2016 to April 4, 2017.