Devon was born in Ontario, Canada to American parents. The family soon moved to New Mexico to be near the Very Large Array astronomical radio observatory, and then to Massachusetts. She earned her Equity card at the age of 11, and acted in productions in Boston, including many at Wheelock Family Theatre. She also danced leading roles with Acton School of Ballet. Devon graduated from Acton-Boxborough Regional High School, and moved to New York City on her 18th birthday. She graduated from NYU's Tisch School of the Arts, where she studied at Circle in the Square Theatre School, and The Classical Studio. She worked for many years in regional theatre before touring the country as Elaine Robinson in the First National Tour of "The Graduate." (Mrs. Robinson was played on the tour by Jerry Hall, Linda Gray, Lorraine Bracco and Kelly McGillis.) Her subsequent move to Los Angeles introduced her to both The Antaeus Theatre Company, which became her theatrical home base, and to her husband, actor Steven Brand. In addition to her work in theatre, film and TV, Devon is an audio book narrator, specializing in young adult fiction.