Biography: Damon Jamal Gupton (born January 4, 1973) is an American actor and orchestral conductor, best known for his series regular roles as Charles Foster on Deadline, Evrard Velerio on Prime Suspect, Adam Page on The Divide, Detective Cal Brown on The Player, Deputy Chief Henderson on Black Lightning, and SSA Stephen Walker on Criminal Minds. He has also co-starred in the films The Last Airbender (2010), Whiplash (2014), and La La Land (2016).