He has been an assistant coach at Pittsburg State, Oklahoma State, University of Mississippi, and Arizona State. Pennell coached at Arizona State from 1998 to 2004.[2] He then ran the Arizona Premier AAU summer league program for two seasons. During the 2007–08 season, he was a color analyst for men's basketball on the Arizona State radio network.
Head coach
On May 5, 2008, Arizona head coach Lute Olson announced the hiring of Pennell as an assistant coach. Pennell became the interim head coach on October 24, when Olson announced his surprise retirement for medical reasons. As interim coach, Pennell has coached the Wildcats to a 19–13 record in the regular season (9–9 conference). Because of Arizona's mid-season success, Pennell had been rumored as a contender for the Pac-10's Coach of the Year.[3] Ultimately, Pennell did not win the award as Arizona slumped at the end of the regular season, but his work as Arizona's coach was enough to get Arizona into the NCAA tournament for the 25th consecutive year. Arizona advanced past the first round, where, as a 12th seed, they upset 5th seed Utah (Arizona's first first round win since 2006) and defeated 13th seed Cleveland State to move on to the Sweet 16 for the first time since 2005. However, Arizona suffered a crushing defeat against overall #1 seed Louisville, losing 103–64. On April 7, Arizona signed Xavier men's basketball coach Sean Miller to a 5-year, $11-million contract, ending Pennell's tenure with the Wildcats.[4]
On August 8, 2013, the Phoenix Mercury announced the hiring of Pennell as interim head coach following the firing of Corey Gaines.[7] Pennell guided the team to the Western Conference finals. He announced after the season that he would not return as coach in 2014, and that he hoped to return to coaching in the college ranks.[8]
On March 5, 2014, news broke that Pennell was expected to be named the next head coach of men's basketball at Central Arkansas. On January 7, 2020 it was announced that Pennell would step down from his position. This move followed a leave of absence for personal reasons he took in December 2019.[9]