David is a Senior Building Science Engineer at RDH Building Science, and leads the airtightness testing group in Toronto. He has a passion for high performance, low-carbon buildings, and a passion for pushing the industry to address the climate crisis. David is regularly involved in both new and existing building work, as well as forensic investigations, testing, and research in both the US and Canada. David has been involved with a number of passive house projects, including Harmony Commons at the University of Toronto, and number of other high-performance buildings.