Dan Bridgett takes up the new post on 11 September, reporting to UK chairman James Tuckey. He joins from London Chambers of Commerce and Industry, where he is director of press and public affairs.
Multiplex has been at loggerheads with Wembley National Stadium Ltd over delays to the project's completion, with June 2007 its latest estimate.
Bridgett - who described the move as ‘too exciting a challenge to turn down' - will need to ensure Multiplex is perceived in the best possible light upon Wembley's eventual handover. He will also emphasise its role delivering major projects in High Wycombe, Newcastle and London's Elephant & Castle. Despite suffering huge losses over Wembley, it posted a profit of A$216.8m (£86m) in the year to June.
Ex-Sun editor David Yelland, who is about to join Brunswick, advised Multiplex while at Weber Shandwick. WS senior account director Fiona McLachlan - Yelland's PA at The Sun, who moved with him in 2004 - has been seconded to Multiplex for six months. She returns later this month to WS, which will continue to provide PR support.
During his three years at the LCCI, Bridgett stressed the harm to businesses caused by the congestion charge. He also worked for the Evening Standard, Mail on Sunday and Sunday Mirror.