About Us

ArchEcology LLC integrates practical, cost effective sustainable strategies from a variety of green building programs into new construction and existing building projects. We work primarily for speculative developers and the private sector, satisfying corporations that are driven by a financial bottom line and take a pragmatic approach to sustainability.

In twelve years, ArchEcology has facilitated more than 115 LEED and other green building certifications covering over 11 million SF. With our guidance project teams create thriving, sustainable urban developments

We are fortunate to serve many repeat clients in both the for profit and non profit sectors and a diverse range of project types from midrise and high rise multifamily and office towers to recreational centers and tenant improvements.

Clients we serve include:

City of Seattle

Google, Inc.


Holland Residential

Trammel Crow

Panattoni Development

Weber Thompson

YMCA of Greater Seattle


Seattle Housing Authority

SRM Development

Wallace Properties

Nancy Henderson founded ArchEcology in 2006 to focus exclusively on green buildings. Using her 25 years experience in architecture and project management, she guides project teams in developing sustainable goals and then integrating the resulting sustainable measures into the development of their commercial and residential projects. A tireless advocate for sustainable design and operation, Nancy provides an expert understanding of practical ways to satisfy a variety of green building goals. Her extensive knowledge of building envelope and energy systems allows her to evaluate energy efficiency strategies against local code and sustainable requirements to recommend the most cost effective approach to compliance. Nancy is a Registered Architect and a LEED Accredited Professional. She served on the Seattle Living Building Technical Advisory Group and is a current Member and previous Board Chair of the Mt Baker Housing Association Board.

Michelle Rosenberger joined ArchEcology in 2007 and has more than 30 years of industry experience. Thoroughly familiar with the design and construction process, Michelle has successfully managed the sustainable certification of dozens of projects under a wide range of green building programs. She helps project teams understand sustainable strategies, evaluate their feasibility and achieve compliance with documentation requirements. Michelle is a LEED Accredited Professional in both New Construction and Commercial Interiors and has a Masters degree in Business. She has created and delivered a wide variety of eco-charrettes, goal setting workshops, training seminars, and green building presentations and has published numerous articles on sustainable topics.

Katherine Morgan brings over 28 years of experience in the environmental and building sector including program development and implementation, project management, policy, research, writing, land development, education and training, and multimedia communications. Katherine helps project teams achieve their certification goals, and brings to bear a perspective on land use and ecological systems as well as ongoing operations and maintenance so that buildings that are built green stay green.   Katherine is a LEED Accredited Professional in Existing Buildings, a Certified Sustainable Building Advisor, and holds a Building Operator Certification -Level 1. She has a Masters degree in Planning and a Bachelors in Environmental Science.

Keaghan brings a strong background in sustainable design, technical analysis and graphic presentation skills to our team. His training in building science and thorough working knowledge of a variety of software programs make him well suited to evaluating site strategies, indoor environmental quality, daylighting and views strategies. Keaghan provides project management and technical support to a variety of multifamily, commercial office and community recreational facility projects. He has a Bachelors in Environmental Science from the University of Idaho and  a Masters degree in Sustainable Design from Jefferson University.

Mugdha is our primary energy modeler and has experience using various energy modeling software such as eQUEST, DesignBuilder and EnergyPlus. She has strong analytical skills for evaluating and reporting on energy savings associated with potential upgrades. She is knowledgeable in the areas of hygrothermal analysis and integrated building envelope solutions. Mugdha has a Bachelor’s degree in Architecture and a Master of Science in Sustainable Design from Carnegie Mellon University. She is a LEED for Homes Accredited Professional.