Sian runs Team Green Architects in Queenstown and was one of the first New Zealand architects to become a Passive House Designer. She previously lived in the UK, working in one of the largest firms as a project architect before moving to New Zealand in 2012. She co-founded the New Zealand Architects Declare movement, which encourages architects to unite and declare a climate and biodiversity emergency and is a regular keynote speaker where she shares her expertise in sustainable construction.