London - Williams' head of performance engineering Rob Smedley will leave the Formula One team at the end of a dismal season for the former world championship winning team, which is struggling to score points.
The 44-year-old joined the British team from Ferrari in 2014 with now-departed Brazilian driver Felipe Massa, with whom he had a very close working relationship as his race engineer.
The Briton became a familiar voice to fans for his radio messages to Massa at Ferrari, including one at the 2010 German Grand Prix in which he relayed a team order for the Brazilian to move over for Fernando Alonso while leading.
"OK, so Fernando is faster than you. Can you confirm you understood that message?" he said.
Williams quoted Smedley in a statement as saying that after 20 years in Formula One "it’s the right time to reflect on things and evaluate what the next move is.