2016 F1 Champ Nico Rosberg now runs the Rosberg Racing Academy, which captured the 2018 Karting World Championship.
Felipe Massa, briefly the 2008 F1 Champ, is currently the President of the FIA Karting.
The two retired F1 stars battled it out in electric karts in Monaco recently. Despite it being all for fun, it’s almost comical how immediately competitive they become (especially Rosberg) and how quickly smiles disappear when the helmets go on!