Well, that was quick.
Here is what you need to know about the man who now takes the top job on the Patriots sideline:
He's a product of the Patriots
Mayo first came to New England as a first-round draft pick back in 2008. The linebacker made an immediate impact, leading the team in total tackles in each of his first five seasons with the team and he was named the Associated Press Defensive Rookie of the Year. He'd go on to pick up two Pro Bowl nods and was on the AP's All-Pro First Team for the 2010 season. He spent his entire NFL playing career in New England, picking up a Super Bowl ring along the way, and retired after the 2015 season.
His last few years have been in New England
Mayo made his way back to Foxborough as a coach in 2019. The linebacker coach has helped guide some of New England's defensive standouts, like Matthew Judon and Dont'a Hightower during his time on the coaching staff.
Mayo is well liked and respected within the organization
Mayo's time as a player has reportedly translated well to his tenure on the sideline, with players giving him high marks. The franchise also reportedly had a succession plan ready to go for him in place so he could become the new head coach without having to go through an extended hiring process.
He'll be making some history
If all goes through, 37-year-old Mayo will be the youngest active head coach in the NFL. That title currently belongs to Rams skipper Sean McVay. Mayo will be the 15th head coach in franchise history.
He will also be the first Black head coach for New England. Up until this point, New England was one of 13 teams to have never had a Black non-interim head coach.
Mayo has a big task ahead of him
Robert Kraft put it bluntly when speaking to reporters on Thursday: He wants someone who can take the team back to the playoffs and win.
Mayo will have a strong defense on his side, but will now also be tasked with overhauling an offense that finished with the third-fewest total yards in the league this season.
For the first time since the start of the century, the Patriots have a new head coach. Now it remains to be seen what he can do in the wake of one of the biggest names in the history of the game.