Greg was elected as the Federal Member for Flinders in 2001.

Raised in Mornington, Greg attended school at Mornington Primary and The Peninsula School. Graduating from Melbourne University with First Class Honours in Law, Greg won an award for the best final year law thesis. He subsequently won a Fulbright Scholarship to complete a Masters in International Relations at Yale University.

After university and a year spent as an articled clerk, Greg became an Associate to the Chief Justice of the Federal Court as well as spending time as an intern with the United Nations Centre for Human Rights in Geneva. Later, Greg worked as a senior adviser to Alexander Downer with responsibility for South East Asia, defence, human rights, trade and international law.

After spending time as Chief Australian Electoral Observer in Cambodia, Greg spent almost three years with McKinsey and Co, rising to the position of Engagement Manager. His time with McKinsey included a secondment as Director of Strategy at the World Economic Forum in Geneva.

In 2004 Greg became Parliamentary Secretary for Environment and Heritage and in January 2007 was appointed Parliamentary Secretary for Foreign Affairs.

Following the November 2007 election, Greg was appointed Shadow Minister for Climate Change, Environment and Urban Water. In September 2008 his role was expanded to include all water responsibilities. Greg is currently the Shadow Minister for Climate Action, Environment and Heritage.

As the Member for Flinders, Greg has completed two 500km walks around the electorate - in 2004 and 2007 – to raise funds for the Juvenile Diabetes Research Foundation.

Greg is married to Paula, and they have a daughter, Poppy, who was born in 2005. They live at Mt Martha on the Mornington Peninsula. He is a keen sportsman and has competed in seven marathons as well as numerous local events.