About Us

The North American Passive House Network (NAPHN) is leading the transformation of the building industry to low-energy, high-performance Passive House design and construction. We support the widespread adoption of the international Passive House design and construction standards, building science principles, and protocols.

A non-profit educational organization – NAPHN’s work is internationally recognized. NAPHN is focused on the inflection point between policy and implementation. We partner with leading stakeholders across all building sectors, including governments, professional associations, manufacturers, owners, builders, labor organizations, and educational institutions – to make the transformation complete.

Our Vision:

A sustainable, post-carbon, all-renewable energy future – supported by buildings that are efficient, comfortable, affordable, resilient and healthy.

Our Mission:

The transformation of the built environment, using the tools developed by the Passive House Institute, in a critical effort to combat global warming. We provide training, conferences, and other events to both engage and educate design and building professionals, policymakers, and the general public. We support the success and vitality of the Passive House community.

Our Values:

Our values are calls to action, making our work itself, inseparable from the world we are working to make.

  • Be Curious – striving for continuous learning
  • Be Inspired – maintaining a sense of wonder
  • Be Visionary – imagining the future
  • Be Bold – calling for urgency and action
  • Be Celebratory – infusing effort with joyful promotion
  • Be Collaborative – making a welcoming & equitable community
  • Be Professional – working with integrity and transparency

If you share these values or will challenge yourself to live up to them to the best of your ability – join us!

NAPHN Structure:

A Nonprofit:

NAPHN is a nonprofit 501c(3) corporation with an independent Board of Directors. The organization bylaws are here – and the conflict of interest policy is here. There are board committees that help organize and govern NAPHN, and current committees and members are listed here. NAPHN has a formal commitment to gender and racial equity in its governance. See the current policies on board composition, here.


We are proud to have achieved the Bronze level GuideStar Seal of Transparency. See our GuideStar profile.


NAPHN Chapters are wholly part of NAPHN. Chapters are led by Chapter Leaders based on a standard Leader Agreement. Chapters are governed by a Chapter Governance Document.  


NAPHN is also a member of the International Passive House Association, part of the Passive House Institute, based in Darmstadt, Germany. See the affiliation agreement here.

Non-Board Committees:

Non-Board Committees include a Technical Committee, to assist North American practitioners in overcoming common technical hurdles and to encourage the broader adoption of the Passive House standard in North America. See the Technical Committee Charter Document.

Board of Directors:

Bronwyn Barry, Chair

Bronwyn Barry is a registered architect based in San Francisco, CA, and a principal of her firm Passive House BB. Bronwyn organized and directed California’s first all-women construction crew for Habitat for Humanity before co-founding both  Passive House California (PHCA) and the North American Passive House Network. Bronwyn’s advocacy work extends internationally. She was an active contributor to the UNECE’s Coalition on Buildings, working to develop a global standard for high-performance buildings. Locally, she has focused on direct implementation by designing and building Passive House buildings since 2008. Bronwyn has contributed as a subject matter expert on a number of research projects in collaboration with researchers at Lawrence Berkeley National Labs (LBNL). Most recently she worked with California’s Codes and Standards team on exploring a Multifamily Passive House Reach Code for California. She directed NAPHN’s policy support programming and edited the NAPHN Policy Resource Guide published in 2019 at NAPHN19. Bronwyn was educated in South Africa, the UK, and the USA and holds a Bachelor of Arts from the University of Natal-KwaZulu.

Lois Arena, Vice-Chair

Lois Arena is the Director, at Steven Winter Associates, for Passive House Services.
Lois possesses over 25 years of experience in the building science field and has extensive experience with new and existing buildings. Lois is currently consulting on some of the largest and most difficult Passive House projects in the world. She has co-authored and presented training programs about energy-efficient building practices to professionals in all sectors of the building industry and is regularly invited to present at conferences and private firms around the world to discuss the benefits of and roadblocks to Passive House adoption. Lois holds a Bachelor of Science degree from the University of Connecticut and a Master of Science from the University of Colorado.

Craig Stevenson, Treasurer

Craig Stevenson is President of AUROS Group, which is a technology company based in Pittsburgh, PA.  Craig is widely known for his role in establishing Pittsburgh as a leader in “Evidence-based Performance” for the built environment.  Evidence-based Performance uses technology to bridge the gap between “hoping” a building is performing as designed to “knowing” a building is meeting its performance goals. With 25 years of construction experience, Craig is an expert estimator and is credentialed in virtually all known building performance standards.  Using these skills, Craig ensures building owners have the data required to build and operate the highest-performing buildings at the lowest possible costs. Craig is co-author of the book, “The Power of Existing Buildings—Save Money, Improve Health and Reduce Environmental Impacts” and the much referenced ASTM article, “Project Case Studies and the Lessons they Teach about Whole Building Envelope Air Leakage Testing.” Craig is a founding member and Vice President of the Passive House Pennsylvania chapter and a member of CEOs for Sustainability.  Craig sits on the City of Pittsburgh Clean Tech Roundtable and P4 Performance Measures Committee.  Craig is also a committee member with the AIA+2030 Committee on the Environment. Craig holds a Masters of Science in Management of Information Systems and an MBA degree from the Graduate School of Business at Duquesne University.

Alexandra Kaplan, Director

Alexandra Kaplan is a Senior Project Manager and Associate Director of Fund Management at the Hudson Companies. Hudson is one of the leading residential developers in New York City of affordable, workforce, and market-rate housing.  Alex is responsible for all aspects of the development process on a wide variety of projects including La Central, a large-scale affordable housing development in the Bronx, the House at Cornell Tech, a Passive House building on Roosevelt Island, and several other mixed-income developments across the five boroughs. Prior to joining Hudson, Alex held positions at the New York City Economic Development Corporation and Jonathan Rose Companies. A common thread in all of her work is a commitment to promoting equitable urban development. Alex is an active member of the Urban Land Institute and the New York State Association for Affordable Housing. Alex also serves on the New York Leadership Council for Bottom Line, an organization that helps low-income and first-generation-to-college students attend and succeed at college. Alex holds a Bachelor of Arts in the Growth and Structure of Cities from Bryn Mawr College and a Masters of City and Regional Planning from the University of Pennsylvania.

Darren Macri, Director

Darren Macri is the CEO of Wythe Windows and Bleu Nest. He is a Certified Passive House Consultant & Tradesperson, LEED AP BD+C. His company Wythe Windows, has a state of the art window factory dedicated to manufacturing high-performance Passive House quality windows and doors located in Ramsey, NJ.  Through Bleu Nest he built New Jersey’s first Certified Passive House. Bleu Nest has since project managed and consulted on many other passive house projects ranging from historic retrofits to multi-family. He is proud to serve on the Board of Directors for North American Passive House Network and as one of the founders of New Jersey Passive House. Darren holds a Bachelor of Fine Arts degree from New York University.

Derrick Tillman, Director

Derrick Tillman is the President and CEO of Bridging the Gap Development, LLC (BTG). BTG founded in 2006, is a socially responsible diversified real estate development firm based in Pittsburgh, PA. Mr. Derrick leads the company’s mission to rebuild sustainable communities through residential & commercial development by “bridging the [real estate and opportunity] gaps” in a community. In order to achieve this goal, BTG develops a variety of projects including multifamily affordable housing, market-rate rental and homeownership properties, as well as mixed-use and commercial development projects. A recent achievement of our firm includes the successful completion of the Miller Street Apartments, a 36-unit new construction Affordable Housing project that has “raised the bar” on Affordable housing from a holistic perspective. The firm has also been able to use its business acumen to innovatively train many unemployed and underemployed individuals with construction and/or weatherization skills. BTG, itself a Minority Business Enterprise, is committed to providing opportunities to other M/WBEs. Derrick holds a Bachelor of Science degree from the University of Pittsburgh.

Eddy Voltaire, Director

Eddy Voltaire is a sustainability consultant with Design Construction & Sustainability Inc (DCS), a New York City-based firm. He is an experienced project and construction manager with a background in real estate, communications, and business development. While very diverse in experience, his approach often involves a distinct sense of play, aiming to put the fun in functional design. His work is guided by a strong belief in design as a problem-solving tool and means of recognizing and forming relationships between ideas and reality. Establishing a method for improving spatial equality, connecting people, community, and environment. DCS’s work exists at the intersection of art and technology. Eddy holds a degree in architecture and energy management from New York Institute of Technology.

Edie Dillman, Director

Edie Dillman is CEO and co-founder of B.PUBLIC Prefab—a component-based high-performance building company that prioritizes energy reduction, carbon-positive materials, housing creation, and collaboration. As co-founder of a decidedly disruptive woman-owned B-Corp., she is committed to systems change and the rapid adoption of solutions through quality craftsmanship, design, and building science. In her previous work at Innovate + Educate, she worked nationally on systematic problems in the education-to-workforce fields seeking critical change for equitable workforce pathways and lifelong learning as director of communications and strategy. She was Associate Publisher and Art Director of New Mexico Magazine from 2012-2017. As an award-winning art director, she ran SmallFires design studio, creating publications for Outside Magazine, branding and identity systems, packaging, websites, and advertising campaigns for private clients. Edie has lived in Santa Fe for 20-years with her husband’s teenage children, two pugs, and a COVID-foster Pitbull mix.  Edie serves on the board of directors of The Santa Fe Art Institute. Originally from Chicago/Evanston and holds a Bachelor of Fine Art degree from Scripps College of Claremont, California.

Jay Murdoch, Director

Jay Murdoch serves as the Director of Industry Affairs at Owens Corning and operates out of the company’s Washington DC office. Jay leads the company’s efforts on model and State energy and building codes and supports the Government Affairs team on policy and regulation impacting buildings. Prior, Jay was the Executive Director of Efficiency First, a trade association of contractors making energy efficiency improvements to homes, low-rise multi-family, and light commercial buildings. In 2009 Jay joined Masco Home Services where he helped lead business development for their existing homes energy efficiency retrofit start-up (WellHome)  and expanding their new homes service offering to builders (Environments for Living). From 1999-2009, Jay had multiple roles in technical services, government and regulatory affairs, marketing, business development, and sales at Owens Corning.  In 2006, Jay led the development of Owens Corning’s Builder Energy Solutions Calculator. Jay also worked at NAHB where he handled electric utility deregulation, ADA & Fair Housing, codes, and standards, and NAHB’s first-generation green building guidelines. Jay also worked in the federal government (the US Access  Board) where he wrote design and construction rules related to accessibility and classroom acoustics under the Americans with Disabilities Act and the Fair Housing Act. Jay is a  recovering builder and designed and built homes and additions as well as commercial projects in the Washington DC metro area and the Turks  &  Caicos  Islands,  BWI.  Jay holds a degree in architecture from the Catholic  University of  America, in  Washington  DC.

Karen Spiegel, Director

Karen Spiegel is a skilled storyteller and reputation builder, especially for brands in transition. Karen has led global marketing and communications across many sectors from clean energy to advertising. Her expertise centers around clarifying complexities, along with the ability to articulate technology in understandable terms while teasing out an organization’s previously unrecognized attributes. With twenty plus years of experience successfully repositioning companies and expanding their global credibility, Karen now leads KS&Co., LLC, where she continues to build brand reputations. Previously she was Chief Communications Officer at FCB, overseeing the company’s global rebranding initiative, and at R/GA as SVP Marketing and Communications, elevating the brand to the most innovative digital agency at the intersection of creative and technology. Karen has continually stressed the importance of communicating clearly and simply with the end goal to improve revenues and expand customer engagement by using analytics. To assist others, she works with Cleantech Open helping clean energy startups to better market their products and services. Karen holds a BA in English History from the University of Pennsylvania and a Doctor of Law from Santa Clara University School of Law.


Ken Levenson, Executive Director

Raised in Vermont, Ken practiced architecture for 20 years in New York City. Starting in 2010, focused on the climate emergency, Ken became a founding board member of New York Passive House, the National Passive House Alliance, and the North American Passive House Network. In 2011 Ken co-founded 475 High Performance Building Supply, with a mission to transform the North American construction industry. Ken has served on advisory panels for Urban Green’s 90 by 50 advanced policy report and the Framework Guidelines for Energy Efficiency Standards in Buildings of the United Nations Economic Commission for Europe. In 2019 Ken stepped down from the board of NAPHN and the management of 475 and volunteered for Extinction Rebellion. In August 2020 Ken became the first Executive Director of NAPHN. When not thinking about Passive House or hanging out with his wife and daughters, Ken can often be found walking their Newfoundland dog in Prospect Park. Ken has a Bachelor of Architecture degree from Pratt Institute.

Sharon Gaber, Managing Director

Sharon is a Managing Director responsible for the development and delivery of NAPHN’s education programs. Sharon has volunteered as a coordinator at GreenhomeNYC and NESEA as well as worked on the Green Building Committee of the American Alliance of Museums. After graduate school, she worked as an Assistant Manager at a high-end luxury antique trade showroom and was struck by the large amount of building waste that is a byproduct of installations. She thought to herself, “Can’t this be reused?” The moment was a “lightbulb” for her. Sharon holds a BA in Art History and Anthropology from Syracuse University and an MA in Museum Studies Decorative Art from the Fashion Institute of Technology.

Madeline Warriner, Administrative & Development Manager

Madeline Warriner is a dancer, educator, organizer, and creative thinker. She brings to NAPHN a commitment to high-quality and efficiency that any Passive House practitioner will appreciate. 
Madeline has orchestrated mindfulness and movement trainings for administrators and educators in Vermont, New Hampshire, New York, New Jersey, and Washington DC.  She has managed non-profits, created websites, produced performances, and organized workshops.
Madeline’s dedication to clear communication, creative problem solving, and rigor will be utilized in support of all of NAPHN’s growing ambitions – from expanding educational offerings, and special events, to increased member benefit support, and much, much more. Madeline holds a Bachelor of Fine Arts in Dance Performance and a Masters in Dance Education from Rutgers University.

Gael Oriol, Community & Communications Associate

Gael Oriol is an architectural designer and has been a parkour practitioner for over 10 years. He has studied building science for over 5 years and has a passion for education and sustainability. He has coached competitive gymnastics and parkour, leading parkour workshops and developing programs for intermediate and advanced gymnastics – involved in successful non-profits organizations in New York City. Gael is a graduate student at the City College of New York and received his Bachelor of Architecture degree from the New York City College of Technology.

Two Passive Houses?

For over 26 years the Passive House Standard has been the state-of-the-art scientific foundation of high-performance and net-zero buildings, around the world. Training qualified professionals is an essential prerequisite for successful Passive House construction. Basic training can be toward becoming a Certified Passive House Designer, Consultant, or Certified Tradesperson. Specialized technical training is also available. NAPHN is dedicated to accelerating Passive House training across North America. Why Are There Two “Passive Houses”? Many are confused about how or why PHI and PHIUS are both promoting “Passive House” but do it separately. This short description aims to help clarify the situation while answering some basic questions. The document is in pdf format here.