Walter leads MéridaLabs. He began his career in clean technology working with Ballard Power Systems, British Gas Investments Canada, and universities more than twenty years ago. He was a founder and Board member for General Hydrogen Corporation, and he co-founded Rethink Climate, a company creation platform based in Vancouver.

He created the Natural Gas Futures research consortium, at UBC and the Transportation Futures Group at the Pacific Institute for Climate Solutions.  He serves on the Board of Directors for the Canadian Hydrogen Association, and the Climate Change Advisory Board for Toronto Dominion Insurance.

At UBC, Walter has served as director for the Clean Energy Research Centre,   as Senior Advisor to UBC's President and Vice-Chancellor, as co-Chair of the Climate Emergency Taskforce, and as a delegate to COP meetings. He is currently the Associate Dean of Research and Industrial Partnerships in the Faculty of Applied Science.