Miller served as an assistant coach at Colorado State, helping the school to an 81-20 (.802) overall record during his three seasons there. He also served as an assistant at Cleveland State and Syracuse.
During his tenure at Bowling Green he compiled a 258–92 record including 135–41 in the Mid-American Conference. He was named MAC Coach of the Year 6 times, and won the conference regular season title 8 straight times between 2005–2012. His best season came in 2006 when he led the Falcons to a 31–4 mark, including a sweet sixteen appearance in the NCAA tournament.
Indiana University
When Miller was negotiating a contract extension with Bowling Green in 2005, he included a "dream clause" in which Miller could list a few of his personal destination jobs.[4] The Indiana Hoosiers were on that list and, when an opening for head women's basketball coach occurred at the school in 2012, he applied for and got the position. Miller signed a six-year deal worth $275,000 a year. Miller resigned on July 25, 2014 citing health and family reasons.[5]
Connecticut Sun
After one season as an assistant with the Los Angeles Sparks, Miller returned to the head coaching ranks. He was announced as the new head coach of the Connecticut Sun on December 17, 2015.[6] In his second season with the Sun in 2017 he was named WNBA coach of the year.[7] While working with the Sun, Miller was "the first openly gay, male coach in college or professional basketball".[8] His 2019 team made the WNBA finals but lost to the Washington Mystics in the five games.[9] The Sun were knocked out in the Semifinals in 2020. His 2021 team finished the regular season in first place with a 26–6 record.[10] but were upset in the Semifinals by the Chicago Sky.[11] He was named WNBA coach of the year for the second time in 2021.[12]
National champion
Postseason invitational champion
Conference regular season champion
Conference regular season and conference tournament champion
Division regular season champion
Division regular season and conference tournament champion
Conference tournament champion