Dallas was born and raised in Houston, Texas, where he attended Paul Revere Middle School and Robert E. Lee High School. He then moved to Sarasota, Florida, where he graduated from Sarasota High School in 1988 and attended Manatee Community College.
In 1990, he was accepted to the Julliard School in New York City, New York, where he graduated in 1994. He then moved to LA to act in plays and eventually movies and TV Series.
- A Home at the End of the World
- Walk the Line
- The Notorious Bettie Page
- The L Word
- He also starred in another AMC television series, Rubicon, where he played a genius-level analyst in a New York City federal intelligence agency.
- He was slated to make his Broadway debut as Tom Wingfield in a revival of Tennessee Williams' The Glass Menagerie, but was replaced by Christian Slater during rehearsals.