She voiced the character of Riff on the PBS children's television series Barney & Friends, Amethyst on the Cartoon Network television series Steven Universe and Steven Universe Future, Dolly Dalmatian on Disney Channel's 101 Dalmatian Street, Pita in Fallout 76, Vee on Disney Channel's The Owl House, and Darryl McGee on Disney Channel's The Ghost and Molly McGee.

Dietz was born in Incheon, South Korea[1] on November 1, 1982, then was adopted and raised in Cooperstown, New York at three months old.

She later appeared in a short in 2009 entitled Red, Black & Blonde as an Auditioning Dancer #1 and Interracial Couple #3 in K-Town.

[6] Dietz has voiced ongoing characters in two American children's animated TV series, Riff in Barney & Friends and Amethyst in the Steven Universe franchise.

[20] She also voiced characters in video games such as Grand Theft Auto V,[21][22] Fallout 76: Wastelanders,[23] and Lego Dimensions.