Speaker Bios

With his holistic and definitive approach, Eric Sassak is heavily involved in the design and development of contract documents for complex projects. As an enclosure specialist for SmithGroup’s Building Technology Studio over the last fifteen years he is responsible for overseeing the production of a unified set of construction documents, integrating detailing to best accomplish both technical and aesthetic design goals, field analysis, and construction administration. Rainscreen systems, architectural metals, coatings, and steep slope roofing are areas of his specialization. Eric is also keenly interested in bringing state-of-the-art building technology solutions to historic buildings.

Don Heft is a recognized leader in cladding engineering and sales, with deep expertise in rainscreen wall design across the North American market. Starting as a materials technician and later advancing to an application engineer at Kawneer, he gained hands-on experience in structural analysis, field problem-solving, and product approvals. As Technical Manager at Trespa North America, Don helped launch key products and built a national network for vertical wall systems. Today, he leads ECO Cladding, an engineering firm focused on thermally efficient sub-framing. Don oversees product development, certifications, and sales strategy, blending technical precision with practical business insight. His work continues to shape best practices in the evolving cladding industry.

Aaron Rosen is a principal at the building enclosure consulting firm RosenBEC. His certifications include Professional Engineer (PE), Registered Building Enclosure Consultant (RBEC®), and Registered Exterior Wall Consultant (REWC®). He has over 20 years of professional experience working with many different types of cladding systems. Aaron has been retained numerous times to provide a third-party expert opinion on a variety of building enclosure related issues. RosenBEC has been providing building enclosure consulting services on high-end projects across the United States since 2016.

Spencer Anderson is the Technical Director for American Fiber Cement with 10 years of experience in the cladding industry. He has experience working in all areas of the building envelope from attachment system and cladding design to installation. He has reviewed numerous fiber cement cladding installations. Spencer has a B.S. Degree in Mechanical Engineering from Clemson University with a Fundamentals of Engineering Certification

Keith P. Nelson joined DuPont in January 2023 with over 20 years of industry experience leading building enclosure consulting for design and construction projects across the US and internationally. He is a licensed Architect in multiple states and joined DuPont with strong experiences in building science, building enclosure forensics, enclosure commissioning, field performance testing, and is an industry leader in NFPA 285 compliance education. Keith leads and participates in multiple standard development organizations, including ICC 1125, ASHRAE 90.1, ASTM E06, and ASTM E05 and was elected to the ABAA Board of Directors in June 2024. He holds a Bachelor of Science in Architecture and a Bachelor of Science in Environmental Design from Ball State University in Muncie, Indiana.

Daniel A. Martin is a Fire Protection Engineer with 9 years of experience at Jensen Hughes related to building code consulting, fire testing, passive fire protection engineering, code development, and fire investigation. Mr. Martin specializes in fire performance and flame spread analysis of building construction materials and assemblies by performing engineering evaluations and as a fire test consultant during qualification testing. Mr. Martin is also a member of numerous NFPA and ASTM Committees and participates in the ICC code development process.

Annie is Co-chair of RAiNA’s Retrofit Committee. She is a Senior Principal and Managing Director of the Diagnostics Group of Walter P Moore in San Francisco. Annie is a licensed Architect in nine states and is a Building Enclosure Consultant and waterproofing expert. She leads Walter P Moore’s West Coast Team in their evaluation of exterior wall façade and rainscreen systems, plaza and roofing assemblies, and below-grade waterproofing. She is Past President of the Western Chapter of the Association for Preservation Technology (APT) and is on the Board of Directors for the International Concrete Repair Institute (ICRI) Northern California Chapter. Annie graduated with degrees in Architecture from Columbia University in New York and Cal Poly San Luis Obispo. She is also a LEED Accredited Pro

Gabrielle is an Associate Principal and enclosure specialist in SOM’s New York office. Her experience includes commercial, institutional, mixed-use and adaptive reuse projects, ranging from super-tall towers to landmarked retrofits. As a facade designer and technical architect, she applies fundamental building science principles to the design of comfortable, durable, and efficient buildings. Her research has been supported by the AIA Upjohn Research Initiative and NYSERDA, and she is co-author of a case study book of passive house retrofits, forthcoming from Routledge in 2026. Gabrielle is a licensed architect, LEED AP, and Certified Passive House Designer. She co-chairs the Education Committee of the Facade Tectonics Institute and is a member of the RAINA Retrofit Committee.

Alex Moshenberg is a Building Envelope Specialist with Metro Building Solutions, Inc. (MBSI), a manufacturer’s representative firm specializing in high-performance building envelope systems. With over 17 years of technical management experience in commercial façades, Alex collaborates closely with leading rainscreen manufacturers to deliver beautiful, durable, cost-effective, and code-compliant solutions for both new construction and retrofit projects. He also serves as Co-Chair of RAiNA’s Rainscreen Retrofit Committee, guiding industry best practices and promoting effective retrofit strategies.