Board of Trustees
Ann Wiedie, Chair
Ms. Wiedie received a PhD in Statistics from the University of Massachusetts, and then taught at Worcester Polytechnic Institute. She has served on committees involving agriculture, recycling and solid waste, and traffic and sidewalks in her town, and was a longtime treasurer of Weston Forest and Trail Association. Her interests center heavily on animals, forests, gardening, and handwork. Ann's daughter attended WSL from early childhood through graduation in 2018, an experience treasured by the whole family and which continues to have meaningful impact on their lives.
Natalie Fry, Vice Chair
Natalie Fry is an experienced educational leader with a strong background in special education and a deep commitment to child-centered learning. Originally from London, she served as an Assistant Headteacher at an Ofsted-rated “Outstanding” special needs school, where she led strategic initiatives, staff development, and inclusive communication practices. Natalie brings extensive expertise in curriculum design, safeguarding, and interdisciplinary collaboration. Now based in Massachusetts and a dedicated parent at the Waldorf School of Lexington, she is passionate about contributing her skills and energy to educational communities that nurture and support the whole child.
Mark Ethier, Treasurer
Mark Ethier is an entrepreneur and investor with a background in music and technology. After earning degrees in music composition and computer science from MIT, he founded iZotope, a company specializing in audio production tools used in music, film, and television. Under his leadership, the company expanded globally and received accolades including two Technical Emmy Awards and a Technical Oscar. Mark brings extensive experience in strategy, finance, governance, and fundraising. He currently serves on the boards of WBUR, Native Instruments GmbH, Curio Spice Co., BusyBox, and the Berklee College of Music Presidential Advisory Committee. He also chaired the board of The Record Co., a Boston-based arts nonprofit, for eight years. Mark and his family joined the WSL community in 2024.. They reside in Lexington and are active members of Follen Church next door.
Lance Brisbois
Lance Brisbois is a higher education administrator who currently serves as a Senior Project Manager in the Office of the President and Provost at Harvard University. Earlier in his career, he spent a decade as a fundraiser for Boston cultural institutions. Born and raised on Boston’s North Shore, Mr. Brisbois earned his B.A. from St. John’s College in Annapolis, Maryland. It was there that he first learned about Waldorf education from a classmate who had attended the Kimberton Waldorf School. Deeply impressed by what he heard, Mr. Brisbois became—and remains—a dedicated student of the holistic philosophy that informs Waldorf’s distinctive approach to teaching and learning. To further his work in education, he is currently pursuing an Ed.M. at the Harvard Graduate School of Education. Mr. Brisbois first joined the Waldorf School of Lexington Board of Trustees in 2022, and he resides in Somerville.
Marcie Holmes
Marcie Holmes is a specialist in compliance, regulatory affairs and business development within global trading companies in the financial technology sector. She has nearly 15 years of experience providing compliance oversight and strategic direction for algorithmic trading firms such as Quadrature Capital, Jump Trading, and RGM Advisors. She holds a MA in Fine and Decorative Art from the Sotheby's Institute at the University of Manchester, UK, and is a graduate of Dartmouth College and Phillips Exeter Academy. Marcie is the mother of two children currently attending WSL.
Dr. Lydia Knutson
Dr. Lydia Knutson is a chiropractor and founder of the Lydian Center, a multidisciplinary holistic health clinic in Cambridge, MA. She is the developer of Axial Stability Method (ASM) chiropractic, the signature treatment approach offered at the Lydian Center. She is interested in how biomechanical injury affects the development of the somato-sensory system and its subsequent role in chronic pain and dysfunction in adulthood. She recently developed a 220-hour postgraduate course for Axial Stability Method, and has received IRB approval for 3 research studies involving ASM with Life University in Atlanta. She is currently researching COVID Post-Viral Syndrome and chiropractic treatment. She has a strong commitment to the non-profit sector and has sat on multiple boards. She currently serves on the Board of Directors for Breakthroughs International, an educational non-profit. In addition to her work in the health field, she was for many years, a professional classical singer. As a graduate of High Mowing, she is honored to be back serving within a Waldorf community.
Nick Lim
Over a 25 year career in "tech", Nick has helped to take companies public, to turnaround challenged enterprises and commercialize research innovations. His for-profit experience includes software implementation, marketing, general management, corporate development, mergers and acquisitions. He is currently President of Sonamine, a boutique artificial intelligence company. His non-profit experience includes volunteering at Dinosaur Annex, a musical ensemble for contemporary music and Margaret Fuller Neighborhood house, a community care organization for immigrants and vulnerable residents.
Nick attended Raffles Institution in Singapore and obtained an AB from Harvard. He plays the classical guitar and is a current class of 2028 parent.
Raluca Buttner
Upon graduating from MIT in 1996 with a Chemical Engineering major and Film Studies concentration Ms. Buttner worked in Merck’s manufacturing and research divisions. Her lifelong love of art and music however, led her to a career change and to pursue a more creative lifestyle. She has enjoyed pursuing her creative interests while raising her three children, all graduates of the Waldorf School of Lexington.
Carlos Trostli
Mr. Trostli joined the WSL Board of Trustees in 2018 and made significant contributions as a member of the Finance Committee and through his involvement in multiple task forces including the Budget Taskforce, the Governance Taskforce (Chair), and the Culture Taskforce. Most recently, Carlos served as WSL’s Head of Strategic Initiatives. Professionally, Carlos is a global business leader with over 20 years of experience working across culturally diverse environments in North America, Latin America, and Europe. Carlos has held various leadership roles in marketing, sales, business development, and general management with major consumer packaged goods companies including Procter & Gamble, Unilever, and PepsiCo, internet service and content provider AOL, and multiple construction and real estate development companies. Carlos has an MBA from The Wharton School of Business at the University of Pennsylvania and is trained as a consultant using an Anthroposophical framework to mobilize organizations and provide coaching.
Tod Wiesman, Secretary
Tod Wiesman is Chief Human Resource Officer at UMass Memorial Health in Worcester, MA, where he’s spent 18 years developing leaders, solving tough problems, and striving to create a great caregiver experience for all. As the father of a Waldorf School of Lexington graduate from the Class of 2016, he’s seen firsthand how a Waldorf education ignited his son’s curiosity, shaped his thinking, and built the discipline that carried him through high school, college, and into a meaningful career and adult relationships. Choosing Waldorf wasn’t just an educational decision for his family—it was a lifelong investment in their son’s wellbeing.
Stacey A Zawel
Stacey A Zawel, PhD is a retired professional with an eclectic background working in the private food industry, not-for-profit policy and advocacy, and small business. She is steadfast in her commitment to pushing envelopes and making progress happen.
In her retirement Stacey is committed to helping people live better lives. She is passionate about helping end elder homelessness and helping disadvantaged children thrive. She is studying Spanish and has lived abroad to become fluent so that she may expand her impact to other countries. Stacey loves cooking, exercising, reading, listening to music, and most of all traveling. She is married with two grown sons (Waldorf School of Lexington grads) of whom she is immensely proud.
Alison DiSalvo-Ryan, Honorary Trustee
After attending the Pine Hill Waldorf School and St. Mark’s School, Ms. DiSalvo-Ryan earned a B.A. from Bowdoin College in Art History and Education. She has worked in HR and recruiting, served on several non-profit boards, and assisted her alma maters with development and alumni outreach. Alison is a mother to five children—she is a current parent and a ‘21 and ‘23 alumni parent.
Kathleen (Kat) Williams, Honorary Trustee
Ms. Williams has over 20 years of storytelling experience within the media and television industry. She is an award-winning video and website producer as well as a former high school social studies teacher in the New York City public school system. Ms. Williams began her career in media at The History Channel, where she helped to build History.com from the ground up. This included the ideation, development, and production of editorial franchises including This Day in History. Later, she led a team of 20+ producers, designers and writers and managed several complete site redesigns. She was responsible for the digital side of History's biggest television launches, such as Vikings and The Bible and produced and executive-produced hundreds of short-format videos, which have been watched by tens of millions of people. Ms. Williams has been nominated for three Primetime Emmy Awards, and won in 2013 for her work with the short series Remembering 9/11. Ms. Williams holds a BA in History from Dartmouth College and a MA from Columbia University’s Teacher College.
Christian Weeks, Honorary Trustee
Christian Weeks is the Chief Executive Officer of enVerid Systems, a pioneer and global leader in air quality and energy efficiency. Christian is an entrepreneurial general manager and business strategist who is passionate about bringing disruptive technologies to market and scaling innovative early to mid-stage companies. Prior to enVerid, Christian was an executive with EnerNOC, Inc, which was acquired by Enel X, the Enel Group’s advanced energy services business line, in 2017. Prior to EnerNOC, Christian worked in Deloitte Consulting’s Strategy & Operations practice. Christian attended the Waldorf School of Lexington from kindergarten to third grade and is a graduate of the Pine Hill Waldorf School, ConVal Regional High School, Dartmouth College, and Harvard Business School.
