Greg was first elected as the MLA for Yorkton in the 2007 provincial election and was re-elected in 2011. He is a long-time resident of Yorkton and a man who has always given generously to his community. Born in Regina, Greg has lived in Yorkton for most of his life.

Greg married his high school sweetheart, Leone, more than 25 years ago. In 1998, the couple started the "Brayden Ottenbreit Close Cuts for Cancer" – an event that encourages volunteers to shave their heads to raise money for cancer research. The charity is named in honour of their son Brayden who died of cancer in 2000 at age 5. More than $600,000 has been raised for cancer research and local cancer initiatives. Greg and Leone have two daughters, Katelin and Rayanne.

Greg has served as the Legislative Secretary to the Minister of Social Services, Community Based Organizations initiative and as Legislative Secretary to the Minister of Environment, Recycling. In June 2010, he was appointed as Legislative Secretary to the Premier for Vulnerable Youth. Greg was also the Chair of the caucus' standing policy committee on human services and the Chair of the legislature's Standing Committee on Human Services.