The head of the FIA's Formula 1 technical department, Marcin Budkowski, has resigned with immediate effect.
Budkowski was regarded as a rising star at the FIA, and a key part of the new generation of heads that, in time, were eventually expected to replace the likes of Charlie Whiting and Jo Bauer.
He has now been placed on three months gardening leave by the FIA.
Budkowski's FIA role gave him extensive access to privileged technical information from teams and engine suppliers, including research and development ideas that are typically run past the FIA before being produced.
Prior to his role with the FIA, Budkowski had worked for both Ferrari and McLaren.
After a brief period at Prost he joined Ferrari in April 2002 as a CFD aerodynamicist, and had become aerodynamic project leader by the time he left in September 2007.
He joined McLaren as senior aerodynamicist, subsequently becoming team leader trackside aerodynamics, project leader aerodynamic development and deputy chief aerodynamicist.
Budkowski subsequently became head of aerodynamics in November 2012, before leaving the team in May 2014.
He joined the FIA that October, and progressed through various roles before becoming head of the technical department in February this year.