Denver

Colin is a Professional Engineer in the United States and Canada and provides operational and project leadership in the San Francisco Bay Area office.

Colin has a broad knowledge of building construction and applies building science principles to analyze and design durable, energy-efficient building enclosures. He shares his experience by regularly speaking about topics related to building enclosures at events across the United States and contributes to industry organizations with the aim of making buildings better.

Colin began his career with RDH in Vancouver before transferring to the San Francisco Bay Area and now plays a key role as part of the leadership team for our California operations.

Voytek Gretka is a whole-building energy modeling specialist and professional engineer with experience throughout the U.S. and Canada, including both new construction and existing buildings in residential, commercial, and institutional sectors.

Voytek’s early career as an Energy Efficiency Standards Engineer with the British Columbia Ministry of Energy and Mines facilitated his involvement in energy codes and standards development across Canada and the West Coast of the US. Voytek continues to be involved in various technical committees and academic-industrial research partnerships.