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 fourteen years, ArchEcology has facilitated more than 125 LEED and other green building certifications covering over 11 million SF. Utilizing our combined experience in design, energy modeling and construction, we have provided practical, data-driven guidance to assist project teams to create thriving, sustainable urban developments.

Clients we serve include:

City of Seattle

Google, Inc.


Holland Residential

Foushee & Associates

Trammell Crow

Weber Thompson

YMCA of Greater Seattle


Seattle Housing Authority

SRM Development

Walsh Construction

Wallace Properties

Panattoni Development

Nancy Henderson founded ArchEcology in 2006 to focus exclusively on green buildings. Using her 27 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 is a member and the 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 25 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. She 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.

Mugdha has more than 5 years experience in energy modeling 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 also knowledgeable in daylight simulations and life cycle modeling. Mugdha has a Bachelor’s degree in Architecture and a Master of Science in Sustainable Design from Carnegie Mellon University.  She is a LEED Accredited Homes Professional.

Ellen is a recent addition to ArchEcology with a background in energy modeling and energy audits for residential and commercial buildings. She will use her analytical skills to provide energy modeling support for a variety of projects pursuing green building certification. Ellen has a Bachelor’s degree in English and a Master of Environmental Management from Duke University, Nicholas School of the Environment.

Chris brings five years of experience on both residential and commercial projects in pursuit of green building certifications, including LEED, WELL Standard, Living Building Challenge, Built Green, and SITES. In addition to the programmatic aspects of green building, he has participated in carbon research studies, drafted CSR goals and implementation, and created tools to assess embodied energy across building types. Chris has worked with a wide range of building types and clientele and provides project management for a variety of multifamily, commercial, and warehouse projects.