David Higgins, currently chief executive of English Partnerships, has taken up the same role for the Olympic Delivery Authority.
Higgins, who ran the Lend Lease Group in Australia in the run-up to the wildly successful Sydney games, will join former Channel Tunnel supreme Jack Lemley, who was appointed ODA's chairman last week.
Olympics minister Tessa Jowell introduced the two men at a press conference, held at her offices in central London yesterday. She described the pair as 'two of the best people there are to do one of the most difficult jobs'.
She said: 'They will oversee what I am reliably informed is the biggest construction project in Europe - the development of the delivery of the Olympic Park.
`They both bring a formidable range of skills and experience to these respective roles. Jack masterminded the construction of the Channel Tunnel - as big a project as you can imagine. And Dave Higgins brings to this challenge a wealth of experience from the private sector.'
And Higgins added: `I am delighted to take on the role as chief executive of the ODA. Delivering the Games is a unique opportunity for the entire country.
'My job is all about delivering these facilities for the world's greatest sporting event in 2012 and assuring a lasting legacy for east London, the rest of the capital and the whole of the UK.'