About Us

Wynn Calder


Liz Guthrie Sustainable Landscape Architect

Tom Sahagian Energy Efficiency Consultant

Torrey McMillan Sustainability Educator

Don Bailey Energy Consultant

Wynn Calder

sustainable schools

Wynn directs Sustainable Schools, LLC. With over 15 years of experience in the field of education for sustainability, he works with K-12 schools, colleges and universities to build environmental literacy and sustainability into strategic planning, teaching and institutional practice. He facilitates professional development workshops, consults on topics such as sustainable operations and sustainability in the curriculum, and conducts campus sustainability assessments. Since 2003, Wynn has been primary consultant on sustainability with the National Association of Independent Schools (NAIS). He developed and chaired the annual NAIS Summer Institute for Leadership in Sustainability from 2005 through 2009.

Wynn is also director of the Association of University Leaders for a Sustainable Future (ULSF), which serves as secretariat for signatories of the Talloires Declaration (1990). He has been with ULSF since 1997.

Wynn is review editor for the Journal of Education for Sustainable Development (Sage), and has written extensively on the topic of education for sustainability. Wynn is a co-founder of the U.S. Partnership for Education for Sustainable Development. He is a member of the expert advisory group of the Green Schools Alliance, he serves on the advisory council of the Cloud Institute for Sustainability Education, and he is on the senior council of the Association for the Advancement of Sustainability in Higher Education.

Prior to joining ULSF, Wynn worked for six years at Harvard University in academic counseling, admissions and administration. From 1984 to 1986, he taught history and was an assistant director of admissions at Milton Academy. Wynn attended Germantown Friends School in Philadelphia. He received his Bachelors degree from Harvard University in 1984 and his Master’s from Harvard Divinity School in 1993. Wynn lives with his family in Wayland, MA.

Liz Guthrie

Liz Guthrie, ASLA, LEED Green Associate, is the Manager of Professional Practice Programs with the national office of the American Society of Landscape Architects (ASLA), and serves as ASLA’s staff liaison to the Sustainable Sites Initiative™ (SITES™), a national rating system for sustainable landscapes.


Liz’s experience includes work as a landscape architect and planner with firms and agencies on the east and west coasts including the Presidio Trust, as well as teaching positions with the National Building Museum, Wave Hill, and several independent schools including Princeton Day School and the Putney School.  As a Board Member of the13th Street Park and Community Garden in Capitol Hill, Liz led the pro-bono landscape design for the neighborhood park and garden, which was completed in 2011.  In June 2012, Liz was invited to participate in “Shifts in Horizon”, a landscape photography workshop with the Marin Headlands Center for the Arts in Sausalito, California. Liz holds a master’s degree in landscape architecture from Cornell University, and a bachelor’s degree in Growth and Structure of Cities from Haverford College. She is fluent in MS Office, Adobe Creative Suite, AutoCad and Vectorworks, and digital and print photography, and has expert knowledge of the Sustainable Sites Initiative™ (SITES™) and LEED® rating systems.

Consulting Services:

  • Researches environmental, cultural and historical site analysis of existing land use conditions
  • Produces site analysis maps in AutoCad, Photoshop, and Illustrator
  • Creates schematic renderings and image boards for proposed site improvements and material selections
  • Writes content on site sustainability and site performance benchmarks
  • Facilitates tailored design and planning sessions for specific learning levels (elementary, middle/high school, faculty etc)
  • Collaborates with sub-consultants on data collection and analysis
  • Experienced facilitator in community outreach and event and meeting organization with diverse audiences
Tom Sahagian

Tom is an independent energy-efficiency consultant.  Most recently he was the Director of the Energy Division at Power Concepts, a New York City consulting engineering firm.


He has more than 30 years of experience in institutional, commercial, industrial and residential energy efficiency. Tom is conversant with virtually every energy-efficiency technology and knows the advantages and the pitfalls of the use of advanced technology. By taking a more hands-on approach to   his work than many of his colleagues, he is able to make recommendations that are practical and effective.

Torrey McMillan

Torrey is a committed and innovative educator with a passion for sustainability. Her more than 10 years of Torrey face shotclassroom teaching experience range from elementary school to university level and across five different academic departments. In addition she has facilitated professional development workshops on sustainability education, systems thinking and biomimicry.

Torrey is currently the Director of Hathaway Brown School’s Center for Sustainability and teaches courses for Baldwin Wallace University’s Sustainability major. Prior to taking her position at Hathaway Brown, Torrey led the creation and implementation of the Sustainability Studies Department,  an academic department focusing on sustainability, at The White Mountain School in Bethlehem, NH.

In her various roles, she has worked with administrators and teachers to establish graduation requirements in sustainability, assisted colleagues with the integration of sustainability concepts into their courses, and developed school-wide co-curricular programming. In addition to having taught courses most people typically associate with sustainability, such as Environmental Science and Climate and Energy, she has also taught courses ranging well beyond “green” topics to include the full spectrum of issues associated with sustainability – Comparative Economic Development, American Democracy, Biomimicry, and Responsible Global Citizenship. She is LEED GA accredited and is a certified Biomimicry Specialist.

Don Bailey

After a long engineering career in flight control system research and development, Don is currently established as a consultant with the Minnesota Pollution Control Agency (MPCA) doing Energy and Waste Management Assessments on Minnesota schools, government buildings, and commercial businesses.  He has developed an Assessment Integrated Support System, A_SYS, for MPCA which provides reference technical material, bill data compilation and analysis facilities, and extensive energy, water and waste savings computation capability, as well as automated upload of energy and water use data to EPA Energy Star Portfolio Manager.