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PHIUS Technical Committee Members

Ryan Abendroth

Principal, Passive Energy Designs LLC

Ryan Abendroth is an experienced Certified Passive House Consultant (CPHC®) and the former Certification Manager at Passive House Institute US (PHIUS). He has worked on hundreds of passive house projects including small residential designs and student projects to mid-sized commercial and non-profit developments, and he has been at the forefront of research and design in passive houses for almost a decade. His first passive house experience was with Team Illinois in the US Department of Energy's Solar Decathlon Competition in 2009, where the team took Second Place overall. Abendroth is a member of the PHIUS Technical Committee and a trainer for the PHIUS CPHC Training Program, the PHIUS+ Rater Program, and advanced tutorials on topics related to passive building construction.

Abendroth also serves as the Principal of Passive Energy Designs LLC, a St. Louis, Missouri-based consulting firm specializing in achieving built high-performance and low-energy buildings that meet the passive house standard. He holds a Master of Architecture and a Bachelor of Science in Architectural Studies from the University of Illinois at Urbana-Champaign. Currently, Ryan is a lecturer at the Sam Fox School of Design and Visual Arts at Washington University in St. Louis where he teaches both graduate and undergraduate courses focused on the impacts of climate, site, energy, detailing, and building information modeling (BIM) on the built environment. Previously he taught at the Rhode Island School of Design as both a Visiting Lecturer and Critic and has acted as a passive house consultant for Kansas University’s 5th year design-build program, Studio 804.

Florian Antretter

Group Manager, Hygrothermal Building Analysis at Fraunhofer IBP

Florian Antretter leads the group for Hygrothermal Building Analysis at Fraunhofer IBP. The group examines the hygrothermal performance and interaction of the building envelope and systems with the enclosed space. The achieved insight is used to develop and apply a hygrothermal whole building simulation tool, the WUFI® Passive software, which allows a detailed analysis with regards to energy use, indoor environment and the hygrothermal conditions in the building envelope. Antretter first gained experience on building sites as a certified craftsman. He expanded his experience in material, component and whole building measurements in the laboratory and in the field through statistical data assessment at Fraunhofer IBP and Oak Ridge National Laboratory. He is an expert in hygrothermal building component and whole building simulation as well as in application of computational fluid dynamics software. His involvement in North American, Asian, and European projects enables him to conduct research and develop solutions in an international environment. Antretter has served as a lecturer in the Civil Engineering program at the University of Applied Sciences in Munich, Germany since 2010, and serves on the PHIUS Technical Committee. He has published more than 20 scientific articles in international journals and conference proceedings.

Prudence Ferreira

Partner, Passiv Science

Prudence Ferreira is a Partner in Passiv Science, a consulting partnership focused on large scale multifamily, commercial, and institutional passive building projects. She heads the firm’s energy modeling team and has unique expertise and experience with WUFI® Passive. Her credentials include LEED AP BD+C, LEED for Homes Rater, GreenPoint Rater Certified Title 24 Energy Analyst, Hygrothermic Analyst, and Certified Passive House Consultant (CPHC®). She is a licensed trainer, core curriculum developer, and exam author for Passive House Institute US (PHIUS), and teaches the CPHC® training program and advanced passive house technical workshops around the US. She helped author the CPHC Exam, helped train over 500 CPHCs, and is a core contributor to CPHC training curriculum. Ferreira also teaches Hygrothermal Analysis around the US as a certified instructor for the Fraunhofer Institute for Building Physics and Oakridge National Lab’s WUFI-ORNL program. She plays a key role in the partnership between the Fraunhofer Institute for Building Physics and PHIUS in developing, beta testing, and field verifying a new energy and hygrothermal analysis design tool specifically for passive, low and zero energy building design and verification.

Ferreira currently serves on the PHIUS Board of Directors, where she previously served as President, and as a member of the PHIUS Technical Committee. She also interfaces with USGBC national technical staff on the LEED for Homes and PHIUS+ Standard integration effort and inputs significantly continuing education program development. Ferreira is a founding member of the PHIUS Technical Committee and has consulted on 30+ passive house projects across 7 different climate zones.

Stuart Fix

Senior Sustainability Engineer, City of Edmonton

Stuart Fix is the Principal of ReNü Building Science based in Edmonton, Alberta, Canada. He is a professional mechanical engineer with a Master’s degree in Building Science and holds certification as a Passive House Designer and PHIUS Certified Passive House Consultant (CPHC®). Fix is a founder and former Director of Passive Buildings Canada and serves on the PHIUS Technical Committee. He has a background in machine design and project management, and has been active in high performance building design since 2008. He focuses on leading edge mechanical design, and is fascinated with the integration of mechanical and envelope systems, in the pursuit of cost effective energy efficiency. Fix is an accomplished technical designer and an experienced contributor to inter-disciplinary groups in a global setting. He concurrently holds the position of Senior Sustainability Engineer with the City of Edmonton, tasked with helping to implement the City's Green Building Plan.

Guenther Gantioler

Director, Passive House Institute Italy & President, Global Passive Building Council

Guenther Gantioler is a graduated energy and environmental consultant and building scientist. Since 1989 he has been working with and educating craftsmen, planners, and the general public about energy saving strategies for buildings. He first discovered the passive house concept in 1995 and has since then concentrated his work on applying passive house technologies in Mediterranean locations and the renovation of important historical landmark buildings to passive house standards. In 1999 he founded the consulting firm TBZ as a consulting institute for passive house building techniques with a focus on combining energy efficiency strategies and healthy materials for high-performance building applications. In 2012 Gantioler founded the Passive House Institute Italy to improve passive house know-how in Italy, and in 2013 he worked as a member of the founding group of the Global Passive Building Council and became the founding president. Gantioler is the author of several technical journals with a focus on energy efficient building construction.

Achilles Karagiozis

Director of Building Science, Owens Corning

Achilles Karagiozis is Director of Building Science at Owens Corning, where he is charged with accelerating energy efficiency improvements in the built environment. Prior to joining Owens Corning, Karagiozis worked at the prestigious Oak Ridge National Laboratory, where he was a distinguished research engineer and hygrothermal project manager. He was instrumental in the launch of a number of innovative construction material and system products, as well as the development of design guidelines, software tools and code changes. Karagiozis received his Ph.D. from the University of Waterloo in Ontario, Canada, with work at the von Karman Institute in Fluid Dynamics in Saint-Genese Rode, Belgium. He received his M.Sc.E. and B.Sc.E. from the University of New Brunswick in New Brunswick, Canada.

Katrin Klingenberg

Co-Founder & Executive Director, Passive House Institute US (PHIUS)

Katrin Klingenberg designed and built the very first home in the United States built to the passive building energy standard. Her experience led her to co-found e-cological Construction Laboratory (e-colab) with builder Mike Kernagis in 2003 as a non-profit affordable housing developer in Urbana, Illinois to further investigate the feasibility of applying passive building principles in the United States. As interest in passive building grew in North America, Klingenberg and Kernagis oversaw the expansion of e-colab into Passive House Institute US (PHIUS) in 2007. PHIUS is now the leading passive building standard setting, research and information provider, training, and certification institute in North America.

Klingenberg has since designed and consulted on numerous passive building projects across North America’s varied climate zones. In her role as Executive Director of PHIUS she directs the technical and research programs of the organization. In addition to her executive role, she is also the lead instructor and director of curriculum development for the PHIUS Certified Passive House Consultant (CPHC®) Training program. Klingenberg earned the German equivalent of a B.S. in Architecture at the Technische Universität in Berlin, Germany, earned an M.S. in Architecture from Ball State University, and is a licensed architect in Germany.

Chris McTaggart

PHIUS+ Rater Program Manager, Building Energy Resources (BER)

Chris McTaggart is the QA/QC manager in support of the PHIUS+ Rater program and leads the PHIUS+ Rater and PHIUS+ Verifier training programs of Passive House Institute US (PHIUS). He also serves on the PHIUS Technical Committee. McTaggart is Co-Principal at Building Efficiency Resources (BER), a national third-party RESNET QA Provider working with independent rating companies throughout the United States. McTaggart brings a background rich in research, analysis and logic developed both through his professional experience and formal education at Michigan State University.

Russell Richman

Assistant Professor, Department of Architectural Science, Ryerson University

Dr. Russell Richman is Assistant Professor in the Building Science Group within the Department of Architectural Science in the Faculty of Engineering & Architectural Science at Ryerson University in Toronto. He has conducted research in building science and sustainable buildings since 1998. Dr. Richman plays a key role in the development and delivery of the Graduate Program in Building Science in the Department of Architectural Science. This program, unique in North America, combines the fundamentals of building science with the broad mandate of sustainable engineering and building design. Dr. Richman also serves on the Technical Committee of Passive House Institute US (PHIUS).

Colin Schless

Associate, Thornton Tomasetti

Colin Schless, CPHC, LEED AP BD+C, has more than 11 years of experience in green building consultancy and leads Thornton Tomasetti Engineering’s Western Region building analytics group. He specializes in commercial building energy modeling, daylight analysis, climate analysis, simulation tool development, and data visualization. In addition, Schless manages Thornton Tomasetti’s efforts with monitoring installations that provide real-time energy and resource consumption data to facilities managers and building occupants. Schless received his Master of Architecture in 2010 from the University of Oregon, where he worked as a Research Fellow at the Energy Studies in Buildings Laboratory. His project experience ranges from a 340,000 sf museum in Riyadh Saudi Arabia, to the Net-Zero Bosarge Family Education Center in Boothbay, Maine, to 120 mixed use buildings owned and operated by Sweden’s largest real estate property holder, Vasakronan. Colin was the CPHC on Village Centre in Brewer, Maine, a 48-unit affordable housing project that won PHIUS’ 2016 Passive Projects Competition awards for the Best Multifamily project and Best Affordable project of the year.

Galen Staengl

Principal, Staengl Engineering

Galen Staengl, P.E., LEED® AP BD+C, Certified Passive House Consultant (CPHC®) has 20 years of experience designing cutting-edge energy-efficient mechanical systems for green building projects and industrial facilities. Throughout his career Staengl has worked to bring energy-efficient and sustainable principles into his designs for award-winning schools, institutional buildings, multi-family residential projects, and office buildings. As Principal of Staengl Engineering he has provided design and energy analysis for many buildings that have achieved LEED Platinum and Gold, PHIUS+, Net Zero energy, Net Positive energy, and Living Building Challenge certification. As a leader in low-energy building system design, Staengl regularly presents at national and regional green building conferences.

In addition to his design experience, he is an accomplished energy modeler using IES VE, DesignBuilder, DOE2, VisualDOE, eQuest and EnergyPro software. This modeling experience includes LEED compliance documentation as well as analysis of specific strategies for energy savings and life cycle costs. He has also provided energy consulting and commissioning services for a wide variety of systems and building types. Staengl currently serves on the PHIUS Technical Committee.

Skylar Swinford

Principal, Energy Systems Consultants

Skylar Swinford is the Principal of Energy Systems Consultants (ESCO), an Idaho-based building energy and enclosure consulting firm. Swinford graduated with a degree in Environmental Science from Willamette University in 2007 and has worked in the high performance building industry since. He is a Certified Passive House Consultant (CPHC®), PHIUS+ Rater, and a BPI-certified Building Analyst and Envelope Professional. He has consulted on hundreds of residential and commercial building projects in the Northwest and across North America. This ranges from his work on many Net-Zero Energy and Certified Passive House projects, to the forensic evaluation of failed buildings.

Lisa White

PHIUS+ Certification Manager

Lisa White has been with Passive House Institute US (PHIUS) since 2012 and currently serves as the project Certification Manager. She is also an instructor for Certified Passive House Consultant (CPHC®) and WUFI Passive software trainings. White holds a degree in Environmental Sustainability with a minor in Architecture from the University of Illinois at Urbana-Champaign, and she is currently pursuing her Master’s in Energy Engineering at the University of Illinois at Chicago.

In consultation with PHIUS Senior Scientist Graham Wright, White works on certification program development, reviews project designs and energy models to evaluate their qualification for PHIUS+ Certification, and provides feedback to project submission teams. She also provides consulting services on static and dynamic energy modeling in WUFI Passive, THERM modeling, and project planning specific to passive building principles. White has presented at numerous conferences and events, including the PHIUS Annual North American Passive House Conferences, the Affordable Comfort Institute national conference, and Facades+.

Graham S. Wright

Senior Scientist & Technical Committee Chair, Passive House Institute US (PHIUS)

Graham S. Wright is Senior Scientist at Passive House Institute US (PHIUS) and Chair of the PHIUS Technical Committee. He leads PHIUS' research and development efforts, and worked to develop the PHIUS+ 2015 Passive Building Standard -- the only passive building standard on the market based upon climate-specific comfort and performance criteria tailored to North American climate zones. Wright helped to launch and continues to provide input for the PHIUS+ Passive Building Standard and Certification program.

In addition to his role as PHIUS Senior Scientist, Wright also established and leads the PHIUS Verified Window Performance Data Program, which evaluates fenestration components for use in passive building applications for specific climate zones. Additionally, he also serves as the Chair of the PHIUS Technical Committee, a consensus based panel of passive building experts who review technical standards and practices and publish the findings.

Wright earned a Ph.D. in Electrical Engineering from the University of Illinois at Urbana-Champaign with thesis work related to ink-jet printing, after which he worked ten years for Eastman Kodak on the development of toner-based printing technology. In 2007 he joined AmeriCorps VISTA and relocated to Minnesota to help the Rural Renewable Energy Alliance develop a durable and efficient solar air heat panel. In 2008 he served as a permaculturalist for the Hunt Utilities Group, which is where he first discovered and became involved with the passive building movement. Wright joined PHIUS first in 2011 as an instructor, in 2012 as a pre-certification caseworker, and in 2013 as Senior Scientist.

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