Beginning in 2002, Impemba joined the Tigers television team alongside color commentatorKirk Gibson, replacing play-by-play commentatorJosh Lewin. In 2003, Gibson was named the Tigers' bench coach and was replaced in the booth by Rod Allen. The Impemba–Allen tandem would last from 2003 to 2018. In the last few years of his tenure, Impemba occasionally worked alongside Gibson and Jack Morris. On September 4, 2018, Impemba and Allen were involved in an off-air physical altercation immediately after broadcasting the Tigers' road game against the Chicago White Sox. Fox Sports Detroit sent the men home on different planes after the game, and the following night's telecast was covered by Kirk Gibson and field-level reporter Matt Shepard. While one source claimed that there was an argument over a chair, followed by Allen putting Impemba in a choke hold, Allen's agent denied that his client choked Impemba. On September 7, Fox Sports Detroit suspended both men from calling any Tigers games for the remainder of the 2018 season. It was later announced that Impemba and Allen's contracts were not renewed for future seasons, ending their 17-year partnership.
On February 13, 2019, Impemba was named as a part-time play-by-play announcer for the Boston Red Sox Radio Network on WEEI. It was announced in January 2020 that he would not return to the Red Sox.
Mannerism and notable calls
Impemba always announces the game's attendance when there is one out left in the game, and usually rounds down, for example "Bottom of the ninth, two outs, the Tigers are about to win in front of a crowd of better than 41,000 fans—41,212 to be exact." Impemba is also known for calling any catch in which the outfielder holds the glove with palm up a "basket catch." His most common home run call is, "to the track, to the wall, gone!" Impemba, along with Rod Allen, called Armando Galarraga's near-perfect game on June 2, 2010. After Jim Joyce mistakenly called the runner safe at first base on what would have been the final out, Impemba stated that he "never felt this disappointed after a Tigers victory."
Awards and other works
Impemba had a Tigers blog named "Last Call," hosted on his now-defunct website, marioimpemba.com. His book, If These Walls Could Talk: Detroit Tigers, was published in 2014. Impemba won a Michigan Emmy Award in June 2006 in the sports play-by-play category, and also won the 2014 DSBA Ty Tyson Award for Excellence in Sports Broadcasting, receiving the award in a special pre-game on-field ceremony at Comerica Park.