Judge Deanna O'Donnell was admitted to the practice of law in 1993. She served as an Associate in the law firm of Burke, Vannucci and Gallagher from 1993-2000. In 1998, Judge O'Donnell became an Assistant Prosecutor for the City of Parma. She was also appointed to develop and implement the City's Juvenile Diversion Program. She served as Director of the Parma Juvenile Diversion Program from 1998-2007. In 2007, Judge O'Donnell was named Chief Assistant Law Director for the City of Parma. She was the first woman ever appointed to this position..
Judge O'Donnell served as Magistrate in the Cuyahoga County Court of Common Pleas Juvenile Division from 200-2007. She served in this position until being elected to the Parma Municipal Court Bench in November 2007.
Judge O'Donnell is a graduate of Holy Name High School, Baldwin Wallace College and Cleveland Marshall College of Law.