As previously reported, Symonds was set to leave his position as F1's chief technical officer after seven years in the job, playing a crucial role in contributing to F1's technical regulations for 2022 and 2026.
With the chassis rules for 2026 all but finalised, Symonds decided to leave the organisation as had long been under consideration.
It has now emerged that Andretti Cadillac is Symonds's next destination, with Michael Andretti's organisation hiring the 71-year-old for the role of Executive Engineering Consultant.
He will work from the team's recently opened a UK base in Silverstone following a gardening leave period.
Landing Symonds is another string to Andretti's bow as the American racing powerhouse aggressively pursues an F1 entry with GM brand Cadillac.
While it was denied entry for 2026, it has not taken no for an answer and continued its preparation, opening the Silverstone headquarters and starting a recruitment drive, with Symonds now emerging as the first major coup.
F1 has left the door open for a new attempt in 2028 with bespoke GM power units.
Symonds was an integral part of the Benetton team that took championships with Michael Schumacher in the mid-90s.
He stayed with the team through its Renault guise until leaving in the wake of the 2008 Singapore Crashgate scandal, before returning to the series as a consultant for Virgin. He then became CTO at Williams and joined the F1 organisation in 2017.
Source: Autosport