The Ohio State football program brought in Arthur Smith to be the offensive coordinator. He is signed for three years, although it's unclear how long he will actually stay. He is getting paid a lot of money to call the plays for the Buckeyes, so he has a lot of pressure to do well.
Smith hasn't coached in college since 2010, when he was a defensive assistant. This will be a massive adjustment for him. He is now the primary play-caller for one of the best offenses in the country. He has Jeremiah Smith to work with, and it sounds like he loves having him.