Reilly formerly served in the United States Army Reserve and was an officer with the New York City Police Department.

[2] He previously served as the president of the Community Education Council (CEC) for District 31, which includes all of Staten Island.

[7] As Assemblyman, he has continued his push to see front doors of academic buildings locked and for retired police officers to serve as supplemental school security.

[9] Reilly announced his support for the Divide NY plan, indicating his desire to see Staten Island become part of the upstate New York region - New Amsterdam.

[10] Reilly received the endorsement [11] of the Staten Island Republican Party's Executive Committee for his 2020 re-election bid.