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For the 2001 season, Dyer moved to Ferrari, working as Schumacher's vehicle engineer, alongside Luca Baldisserri. By the end of 2002, Dyer engineered Schumacher at the tests; after the championship had been won, he also race engineered Schumacher at the last three races at Monza, Indianapolis, and Suzuka. Dyer then race engineered Schumacher to his 2003 and 2004 world titles, appearing with the German on the podium after his triumph at the 2003 Canadian Grand Prix. Dyer was quoted saying: "One of Michael's strengths is that, apart from driving quickly, he has an understanding of the car and how all the systems work."
Dyer took over as Räikkönen's race engineer when the Finn moved to Ferrari in 2007. Despite suggestions that the pair did not always get the most from the package, Räikkönen took the title in 2007 at the final race by a single point over Lewis Hamilton and Fernando Alonso. After the disappointing results in the 2008 season, Ferrari announced that Dyer would be replaced by Andrea Stella for the 2009 season, with Dyer promoted to chief track engineer.
On 4 January 2011, Ferrari announced that Dyer was replaced as head of race track engineering by former McLaren engineer Pat Fry. This decision was taken after Dyer made the call to bring Alonso in the pit lane to cover off the Australian Mark Webber's pit stop in the final race of the season, the 2010 Abu Dhabi Grand Prix. The decision was blamed for costing Alonso the title in favour of Sebastian Vettel who went on to become champion. In October 2012, it was announced that Dyer was to join BMW's Deutsche Tourenwagen Masters (DTM) programme as chief engineer.
Renault
On 4 February 2016, it was announced by Renault Sport that Dyer would be returning to Formula One as their head of vehicle performance group.