Williams has announced a number of changes to strengthen its engineering team ahead of the 2015 F1 season.

Dave Robson joins the team from McLaren to be Felipe Massa's race engineer, with Robson having previously carried out the same role for Jenson Button. The recruitment of Robson comes with Massa's previous race engineer - Andrew Murdoch - being promoted to senior performance engineer.

Other changes see Carl Gaden promoted to senior car systems engineer after 22 years as chief mechanic on the race team. Mark Pattinson - previously Number 1 mechanic on Massa's car - steps up to take on the role of chief mechanic.

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Williams chief technical officer Pat Symonds said the changes are a positive step designed to help the team capitalise on an impressive 2014 season.

"Off the back of a great 2014 campaign Williams is determined to continue this positive momentum into the new season, and these recent changes show our commitment to that goal," Symonds said. "We are proud to be able to promote our existing talent to help strengthen every area within our engineering team and we will continue to invest in new talent where necessary to ensure we have the support and resources to achieve our on-track ambitions throughout 2015 and beyond. Our engineering team for the coming season is looking strong and I'm excited to get the new season underway."