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Born in Bendigo, Victoria, Dyer worked with the top V8 Supercar outfit, the Tom Walkinshaw owned Holden Racing Team in the mid nineties alongside drivers such as Peter Brock and Craig Lowndes. In 1997, he switched to Walkinshaw's Formula One team Arrows, working as Damon Hill's chief data engineer. In 1998, he stepped up to race engineering, working with drivers such as Jos Verstappen.
For the 2001 season, Dyer moved to Scuderia Ferrari, working as Michael Schumacher's vehicle engineer, alongside Luca Baldisserri. By the end of 2002, Dyer engineered Schumacher at the tests, and after the championships had been won, at the last three races at Monza, Indianapolis and Suzuka. Dyer then race engineered Michael 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 that '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 then took over as Kimi Räikkönen's race engineer when the Finn moved to Ferrari in 2007. Despite suggestions that the pair didn't 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. However, 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 Fernando Alonso into the pits to cover off the Australian Mark Webber's pit stop in the final 2010 race, at Abu Dhabi. This decision was blamed for costing Alonso the drivers 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 DTM programme as chief engineer.
On 4 February 2016 it was announced by Renault Sport that Dyer would be returning to F1 as their head of vehicle performance group.
- 1997: Arrows Data Engineer
- 1998-2000: Arrows Race Engineer
- 2001-2002: Scuderia Ferrari Vehicle Engineer
- 2003-2006: Scuderia Ferrari Race Engineer, Michael Schumacher
- 2007-2008: Scuderia Ferrari Race Engineer, Kimi Räikkönen
- 2009-2011: Scuderia Ferrari Chief Track Engineer
- 2011-2012: Scuderia Ferrari team member
- 2012–2015: BMW Deutsche Tourenwagen Masters Chief Engineer
- 2016-present: Renault Sport F1 Team Head of Vehicle Performance Group
- "The Ferrari Team Profile". Retrieved 2 September 2013.
- "Guiding the world champion". TheScuderia.net. Retrieved 2 September 2013.
- Schumacher's back seat driver: retrieved 30 October 2008
- ...And kimi be so slow: retrieved 29 October 2008
- Brazilian GP - Sunday - Race Notes: retrieved 29 October 2008
- Jonathan Noble (4 January 2011). "Ferrari reshuffles engineering staff". Autosport.com. Retrieved 5 January 2011.