Mr. Pfizer is not a specific person, but rather a nickname given to Travis Kelce by Aaron Rodgers during an interview on "The Pat McAfee Show". The nickname is a reference to the Pfizer commercials that Kelce has appeared in, as he has become a spokesperson for getting flu and COVID-19 vaccine shots at the same time. Kelce had also partnered with Walgreens in June 2021 to encourage people to get the vaccine.