"F1 has brought me a lot of good fortune, but none greater than answering Toto’s call to join Mercedes in 2017," said Allison. "It is a great privilege to continue this adventure, working alongside brilliant colleagues and fighting together for championship success."
Wolff said: "I am thrilled that James has committed his long-term future to the team. Put simply, he is the most impressive technical leader in our sport. His gladiator spirit, along with his knowledge, experience, and determination, make him second-to-none.
"His influence and impact, however, goes so much further than that. Since joining in 2017, he has been a key ally and sparring partner for me personally. We can challenge each other openly and honestly; an embodiment of the 'tough love' culture of the team that is vital in helping us all perform at our very best.
"Most importantly though, James is a true friend you can rely on, not only in times of success but in difficult moments too. It has been a pleasure to work with him over the past seven years and I look forward to doing so for many more to come."
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.