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Meet Our Staff

Margaret Lo, University Sustainability Director

Margaret Lo photo
Margaret Lo joined the Office of Sustainability in 2011. Her responsibilities include strategic planning, leadership development, budgeting, and administration for the Office as well advancing the sustainable practices on campus. Margaret compiled Mason's first Sustainability Tracking, Assessment, and Rating System report to measure the university's sustainability performance.

Previous to joining Mason, Margaret led sustainability reporting and marketing campaigns for the University of Central Florida (UCF) in Orlando. At UCF, she authored UCF's first climate action plan as well as managed several energy reduction programs that were highlighted by the U.S. Department of Energy. Margaret has also worked with Fortune 500 companies to reduce their environmental impact and encourage corporate philanthropy as a corporate partnerships manager with The Nature Conservancy, one of the largest environmental non-profit organizations. Margaret received her Master in Business Administration from the Ross School of Business at the University of Michigan and her Bachelors in Science in Business Management from Binghamton University, State University of New York.

Heidi Wolff, Sustainability Program Manager

Heidi Wolff

Heidi Rae Wolff is the Sustainability Program Manager in which she manages the Patriot Green Fund (PGF) while providing leadership and support in promoting green buildings and infrastructure on George Mason University’s campuses, sustainability reporting, fundraising, and integration with academic units. The PGF is an annual $100,000 fund dedicated to student sustainability research and improving the sustainability of infrastructure across Mason’s campuses. Prior to working for the Office of Sustainability, in 2012, Heidi helped set up the Honey Bee Initiative, a PGF project.

Heidi honorably served 5.5 years in the Navy, where she specialized in airport surveillance radar and communications equipment management. After leaving the military, Heidi studied at The George Washington University where she earned a B.S. in Biological Sciences. 

In addition to her studies at GW, Heidi worked in the GW Energy and Environmental office, and helped establish and manage the GW Bee Lab. She also spearheaded multiple native plant and pollinator gardens including the prominent Veterans Memorial Park. As the Veteran Community Outreach Coordinator for the GW Student Veterans group, Heidi lead community service projects that focused on the conservation of native plants and pollinators. Through her Urban Green Bee program, Heidi conducted a pollinator education and outreach program for children from Boys Town.

Amber Saxton, Sustainability Outreach Specialist

Amber Saxton

Amber supports the development and implementation of Mason’s sustainability plans and practices, and collaborates with advocates across campus to green Mason. Joining the team in late 2016, Amber was already a part of the Mason family working in the Provost’s Office for nearly two years. She now promotes and manages campus-wide events; creates marketing and educational materials; conducts audits, trainings, and educational presentations; analyzes data and best practices; and oversees interns, among other activities.

She got her start in the field of sustainability at the Alliance to Save Energy in Washington, D.C. As a Research Associate she worked on policy development and program activities focused in Asia and SE Europe. Projects included energy efficiency (EE) policy, EE in public buildings and transportation; Energy Star’s ratings framework; US-China eco-city exchanges; water and energy systems; EM&V; and gender issues in climate change for contracts with the World Bank, US DOE, USAID, and APEC, among others.

Amber received her M.A. in International Relations from Seton Hall University, and her B.A. in International Studies from Ohio University. Her graduate internship was in Domestic Policy at The Clinton Foundation, and her other formative experiences include consulting-for-credit for Proctor & Gamble, as well as the Embassy of Poland and the Embassy of Hungary, and studying abroad in Merida, Mexico.

Doni Nolan, Greenhouse Coordinator

Doni Nolan
Doni Nolan graduated from Mason in the spring of 2014 with her BA in Biology. During her years as a student she volunteered for Monica Marcelli in the greenhouse and always dreamed of having her own greenhouse one day. For three years she was the President of the GMU Organic Garden Association.

She joined the Office of Sustainability in 2013 as the summer intern for the Potomac Heights Organic Vegetable Garden and later as the assistant coordinator for the 2014 Permaculture Design Certification Course. After working all summer in the garden, she knew that growing food was her passion. She is delighted to continue teaching students and community members about growing their own food through her current position as the Greenhouse Coordinator for the President's Park Greenhouse. The facility will utilize hydroponics to grow lettuce, micro greens, basil and other herbs that will be served at Ike's dining hall. If you would like to get involved, please contact Doni at To learn more about the greenhouse go to

Mary Liang, Sustainability Analyst

Mary Liang

Mary Liang is a sustainability analyst in which she tracks the data to make the business case to deliver more sustainability projects on campus.  

Prior to joining Mason, Mary worked for a solar energy non-profit in Washington, DC, growing their solar schools program, and developing a report on installing solar energy systems on top of public schools in the state of Maryland. She has also worked at the Office of Sustainability at Indiana University in Bloomington, tracking the university’s Leadership in Energy & Environmental Design (LEED) projects. Mary grew up in New York City, received her B.A. in environmental science at Franklin and Marshall College, and a dual master’s degree in sustainable development and energy policy at Indiana University – Bloomington.