He calls games for the Cincinnati Reds and MLB on Fox. He also called games for the Arizona Diamondbacks and the Chicago Cubs. He is a play by play announcer for the NFL on Fox and fills in for Joe Buck. He was the lead announcer for the BCS on Fox and college football on the Big Ten Network. He has also called college basketball games as well. He called games for FSN and CBS Radio and called Cotton Bowl games from 2000-2006. He is the son of radio announcer Marty Brennaman. Thom has called basketball games for the University of Cincinnati.