Design, Consulting, Team Leading and Training

Team and Strategic Partners


Achieving the Passive House standard requires precision and great leadership.  Therefore, we have put together the finest team and strategic partnerships with a purpose.

We will employ this team to create the “Elbow Room” required in bringing Passive House and ZEPH to the forefront of the Green building movement, building the finest structures in North America along the way.


The ZEPHER Group Leadership
Vic Weber, CPHC, Principal

Vic served 22 years in the US Navy as a pilot flying FA-18 Hornets, F-16 Falcons, and F-5 Tiger II jet aircraft. bio-comingsoon He served as the:

  • Joint and Air Training Officer at US Third Fleet
  • Director of Flight Operations at the Naval Strike and Air Warfare Center
  • Director of Training at the Navy Fighter Weapons School - TOPGUN
  • Numerous tours in operational FA-18 squadrons.
A  NY Times article on Passive House caught his attention in 2008 and he knew immediately what he wanted to do for a follow-on career.  He re-ignited his passion for engineering and was accepted by the Passive House Institute US for consultant training.  His leadership and presence have made an impact from the moment he joined the community.  This is evidenced by the who's who of the Passive House community who have joined with Vic to form the ZEPHER Group.

 Vic brings his strong, combat proven leadership to the ZEPHER Team, and an infectious, bold new perspective to the green building world.

  For Vic, as a former Navy man, it seems fitting that the first fully functioning Passive House was a ship.
Polar Ship Fram of Fridtjof Nansen

Certifications and Education

  • Certified Passive House™ Consultant
  • Bachelor of Science, Engineering, University of Oklahoma


The ZEPHER Group Architectural Leadership
Dan Weaver, AIA

Daniel Weaver
Dan is founder of a sustainable architecture and development company, Three-Sixty-One, based in Mill Valley CA and Sun Valley ID.

The company combines the cooperative spirit of education with the process of creating healthy, well-designed, environmentally-conscious buildings.

Dan has been involved in energy efficient and breaking technology since the early 1990’s. He has vast experience in new insulation techniques, passive solar design, and designing to green building standards.

He is also involved in public school education, helping to start San Francisco’s first public charter high school, Leadership High School.

Certifications and Education

  • Bachelor of Science, Conservation of Natural Resources, UC Berkeley
  • Master of Science, Architecture, University of Washington


The ZEPHER Group Passive House Consultant Leadership
Graham Irwin, CPHC

Graham-IrwinGraham has worked in the construction industry as a:

  • Carpenter
  • General contractor
  • Building designer
  • Consultant
Graham is actively involved in Passive House design, advocacy, promotion and education. Graham served as the Passive House Consultant on the first Passive House retrofit completed in the US.

In addition to project-based work, he advises government agencies on energy policy and lectures regularly for Passive House Consultants training in support of the Passive House Institute, US (PHIUS).

Certifications and Education

  • Certified Passive House™ Consultant
  • Build it Green Certified Green Building Professional
  • NCBDC Certified Professional Building Designer

The ZEPHER Group Energy Consultant Leadership
Prudence Ferreria, CPHC Prudence is a high-performance building, energy and building science consultant with an expertise on the Passive House energy standard. She lectures and presents regularly at conferences and universities on the west coast and nationally.

Prudence Ferreria

Ms Ferreira has served as:
  • President of Passive House California
  • President of the USGBC Redwood Empire Chapter
  • Technical Advisor to the National Passive House Alliance.
Her firm Integral Impact Inc consults on multiple Passive House, LEED Platinum, zero energy and Living Building Challenge projects.

Certifications and Education
  • Certified Passive House™ Consultant
  • LEED AP, LEED for Homes Rater
  • Certified Energy Plans Examiner, Certified Energy Analyst HERS I, II and PV Rater
  • BPI-trained Building Performance Analyst
  • Certified Permaculture Designer
  • Bachelor of Fine Arts, Marymount Manhattan


The ZEPHER Group Builder Leadership
Rick Milburn, CPHC

Rick-MilburnBorn in Salt Lake City, UT in 1969 and raised in Southern California, Rick grew up with an innate talent and interest in the process of building.

His first job in the trades at the age of thirteen was followed by years of mentoring by seasoned building professionals through summer positions and later apprenticeship periods.

During his formative years, he had the privilege to serve in the USMC and with the support of his parents, the G.I. Bill and a hammer to earn his way, he graduated with a B.S. from the University of California, Davis.

In 1996, he had the opportunity to move to the Napa Valley and start his own company.

He's been building in Northern California ever since with one goal in mind - "Better Buildings".

With that mindset, Dan built the first Certified Passive House in California, which was also the very first Passive House retrofit in the United States.

Certifications and Education

  • Certified Passive House™ Consultant
  • Certified Green Builder
  • Certified Photovoltaic Installer
  • Bachelor of Science, UC Davis
  • Advanced Photovoltaics
Certified Passive House Consultant
Certified Passive House™ Consultant