Upon graduating from law school, he joined Houston's Fulbright & Jaworski law firm, where he later became partner in 1986. Miller remained at this law firm until his appointment to the district court.
After graduating from law school, he enrolled with Houston's Fulbright & Jaworski law practice, and eventually rose to become a partner there in 1986. Miller continued working at this law firm until he was appointed to the district court.