Winning memorable races and breaking countless records. Thank you for everything, Christian!” F1 champion Max Verstappen of Red Bull posted on social media.Horner had been Red Bull team principal since it entered F1 as a full constructor in 2005.

After 20 years at the helm of Red Bull Racing, Christian Horner is out as team principal and CEO, effective Wednesday. The bombshell move comes at a tumultuous time for the Formula One team as it struggles to create a competitive car, sitting fourth in the constructors’ standings largely thanks to Max Verstappen’s performances this season.