In 2002, he signed with a voice-over agent in New York and began working in this field full-time. Brett is now represented by Abrams Artists Agency, with whom he signed in 2006. He is regularly called for young adult, thirty-something and middle-aged roles for television and radio commercials and narration.

Brett’s training includes improvisational acting at Manhattan’s HB Studio, study of the Linklater voice techniques, and private coaching with some of the industry’s top voice performers.

In addition to his voice work, Brett also runs Silver Hollow Audio, a small audio production studio in New York's Hudson Valley.