Tennessis Guerrero is an Associate with Marks, O’Neill, O’Brien, Doherty & Kelly. She is admitted to practice in Pennsylvania.

Tennessis graduated from the City College of New York in 2017, with a bachelor’s degree in political science. She attended Widener University Delaware Law School, graduating in 2022. 

During law school, Tennessis participated in Trial Advocacy Internal Competition and was a member of the Moot Court Honor Society, as well as Treasurer of the Black Law Student Association. 

Prior to attending law school, Tennessis was employed as a Legal Assistant. During law school, she interned for Dauphin County CASA, York County Public Defender’s Office, Central Pennsylvania Legal Clinic, and Dauphin County Public Defender’s Office.

Outside of work, Tennessis enjoys traveling, reading, and outdoor hikes.