Samuel Brent Oscar Riegel, sometimes credited as Jack Lingo, is an American voice actor, director, and writer. He is a regular cast member of the web series Critical Role, in which he and other fellow voice actors play Dungeons & Dragons. He is best known for voice roles as Donatello in the 2003 Teenage Mutant Ninja Turtles series and Phoenix Wright in the Ace Attorney games. For Nickelodeon, he was the voice director for Fresh Beat Band of Spies and Sanjay and Craig, as well as the voice of Riven in the Nickelodeon revival of Winx Club.
