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.

Kellie Knuff Perkins is an accomplished leader in the architectural building industry, currently serving as Business Development Manager at the Nucor Insulated Panel Group (NIPG). In this role, she develops market strategies, supports continuing education for industry professionals, and promotes cutting-edge rainscreen and insulated metal panel (IMP) solutions.

Prior to joining NIPG in December 2024, Kellie served as Director of U.S. Business Development at EQUITONE, a manufacturer of high-density fiber cement panels used in rainscreen façade systems. With over 15 years of experience, she has built her career on delivering innovative exterior cladding solutions and fostering strong relationships with architects, general contractors, and building owners.

Kellie has held various roles with leading construction material manufacturers, honing her expertise in building envelope systems. She began her professional journey in design and construction as a Business Development Manager at the architectural firm Goshow Architects.

Since 2020, Kellie has played an active leadership role in the industry, serving on the Board of Directors and as Second Vice Chair of the Executive Committee of the Rainscreen Association in North America (RAiNA), where she contributes to advancing best practices and educational initiatives in façade design.

Kevin D. Nolan has over 37 years of experience in the construction industry, as a Carpenter/
Superintendent, a General Contractor and a Forensic Architectural Consultant. He has dealt almost
exclusively with the Building Enclosure for 27 of those years, repairing, re-cladding and diagnosing
failed systems. Currently, he serves as the Technical Director for VaproShield LLC, an innovative
Manufacturing Company of Water Resistive Barriers and Air Barrier Materials designed for
rainscreen applications. His duties at VaproShield include Research and Development of new
products and the continued improvement of existing products to meet the company’s high standards of performance. He currently is a member of the Air Barrier Association of America and the Rain Screen Association in North America, and is an active on multiple committees. Kevin holds aBachelor’s degree in Business “Finance” from Seattle University. He lives in Seattle, (where they know little bit about rain), with his wife Kelly and their German Shepards Xander and  Klaus.

Brian Hee joined EDA in 2007. In his current role as Vice President of Operations he is responsible for both office operations and field operations for the Philadelphia Metro Area including managing project management directors, project managers, assistant project managers, general superintendents, and superintendents. He has executive responsibility for construction of all projects in the business unit.  Brian has experience working on multifaceted projects including EDA Envelope projects with multiple scopes of work. He began his career with Turner Construction Company in various positions ranging from field supervision, project management, and their cost department.

Brian graduated from the Catholic University of America with a Bachelor’s Degree in Architecture, with a concentration in Construction Management.

Siena has over a decade of experience in the AEC industry providing building enclosure consulting services on large and complex projects from design through construction. She works directly with multiple project stakeholders including owners, architects, construction managers, developers, as well as subcontractors and manufacturers.. She specializes in new construction, focusing on the design, integration, and performance of rainscreen cladding, curtain walls, glazing systems, roofing, plaza waterproofing, and below-grade waterproofing.

Siena holds a B.S. in Civil Engineering from Worcester Polytechnic Institute (WPI) and an M.S. in Sustainable Building Systems from Northeastern University. She is a licensed Architectural Engineer in MA and teaches an undergraduate course in Building Enclosure Design at WPI.

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.

For nearly two decades Mr. Wetterau has been working in the exterior enclosure industry as a consultant, testing agent, and contractor.   A graduate of Roger Williams University in Bristol RI with a Bachelor of Science, he carries a PE license in New York State for Civil engineering.  He has worked on a multitude of building typologies ranging from modern curtain wall systems to historic landmarks including several retrofits and modernization of existing post-war buildings.  Mr. Wetterau has a real passion for building restoration and strives to be a good steward of the rich and historic architecture in New York.  

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.