"I'm looking forward to coming to Edinburgh," he said. "It's a lovely city and I want to bring a winning culture to the team."
"Looking at some of the players already there, such as Mike Blair and Chris Paterson, there is a lot of potential in the squad.
"Coming from Brumbies, I am used to being involved in the building of a successful team.
"One of the things that attracted me to Edinburgh is the team environment and the way in which my contract negotiations were carried out."
The 32-year-old has played 95 Tests and scored 24 tries since making his debut in 1996 and was part of Australia's World Cup-winning team in 1999.