The Weidt Group staff professional affiliations & collaborations include:
- Founding Members, Building Energy Performance Standards (B.E.P.S)
- Founding Members, ASHRAE 90.1 Committee
- Founding Members, NFRC
- Founding Members, International Program for Measurement and Verification Protocols (IPMVP) for New Construction
- Contributors to NCARB Sustainable Design Monograph
- Principle Contributors to the Minnesota Sustainable Building Guidelines
- Member, U.S. Green Building Council
- Founding Member, USGBC-Mississippi Headwaters Chapter
- Members, American Institute of Architects (AIA) & AIA Minnesota
- Members, American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) & ASHRAE Minnesota Chapter
- Energy Star Partner
- Board of Directors, Midwest Energy Efficiency Alliance
- Co-chair, Energy Alley CIP Workgroup
- Board Member, Minnesota Environmental Initiative
- State of Minnesota Energy Code Advisory Committee
- Conservation Improvement Program Advisory Committee
- Member, Minneapolis Regional Chamber of Commerce