Samuel Brent Oscar Riegel, sometimes credited as Jack Lingo, (born October 9, 1976) is an American voice actor, director, and writer. He voiced Taniguchi in the English dub of The Melancholy of Haruhi Suzumiya and The Disappearance of Haruhi Suzumiya. He also voiced Eijirou Ohmori, the Appliance Store Owner.
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 revival of Winx Club.