The A-Team

Stephan Tanner, Registered Architect AIA
Tim Eian, Dipl.-Ing. Arch. and Certified Passie House Consultant and Designer

Both principals work directly on every project, contributing over 50 years of combined experience, extensive knowledge and unique backgrounds to consistently go above and beyond standard expectations.

Stephan R. Tanner

Registered Architect AIA

Lives in Watertown, MN

Works in Minneapolis, MN

Stephan is a Swiss-born American architect with forty years of experience in high-performance real estate development, planning and design around the globe. His professional interest, combined with his passion for people, has led him to gain true international knowledge and local understanding. He is a graduate of the Minneapolis College of Art & Design and is recognized as one of the key leaders in sustainable design in the United States.


Stephan brought Intep to North America in 1998 and served as Principal since its incorporation in 2001. He provides sustainability consulting services for private real estate companies and public entities.



“Stephan is an experienced, passionate, unrelenting advocate for continual improvement and documented results.”

Former Client

Tim Delhey Eian

Dipl.-Ing. Arch. (Architectural Engineer)

Certified Passive House Consultant and Planner

Lives & works in Minneapolis, MN

Tim is a German-born and trained architectural engineer with over fifteen years of professional experience in innovative high-performance designs. He is passionate about holistic design solutions that deliver on all aspects of sustainability. In addition, Tim is a master carpenter, graduate of the technical University of Kaiserslautern, Germany, and one of the first professionals in North America to design a certified Passive House building.

Tim's focus at Intep is on high-performance and sustainable building design, energy-modeling, and project analysis. His expertise spans from planning and ecological construction to inventory and process analysis, as well as site supervision.



“Tim is the most innovative and progressive professional I know. The passion and knowledge he brings to projects is unparalleled. He is an asset to any project he is involved in.”

Former Client