Television:
* The Wire (2002-2008): He played the recurring role of Detective Milton "Little Man" Steedle.
* Law & Order: Special Victims Unit (1999-present): He had a guest appearance in the episode "Savior."
* The Blacklist (2013-present): He starred as the character, Agent Marvin Gerard, for multiple seasons.
* The Deuce (2017-2019): He played the role of C.C. in this HBO drama series.
* The Good Wife (2009-2016): He appeared in one episode as a character named Tony.
* Blue Bloods (2010-present): He had a guest appearance in the episode "The Price of Justice."
* Unforgettable (2011-2012): He appeared in one episode as a character named David.
* Person of Interest (2011-2016): He appeared in one episode as a character named Curtis.
Film:
* The Taking of Pelham 1 2 3 (2009): He played the role of Agent Garcia in this action thriller film.
* The Departed (2006): He played the role of a detective in this Academy Award-winning crime drama film.
* The Hurricane (1999): He had a role as a prison guard in this biographical sports drama film.
This list highlights some of Dion Graham's significant projects, but there are many other film and television appearances he has made throughout his career. You can find a more comprehensive list on websites like IMDb.