Meet our Members





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sean mcnall, President

Term Expires: June 2025

Sean was elected to the Board of Education in 2019. Before joining the Hudson Valley Shakespeare Festival as Director of Education and Associate Artistic Director in 2014, he was a ten-year resident company actor with the Pearl Theatre Company NYC, where he also directed education programs and worked as a teaching artist in the New York City Public School System. Sean is a graduate of the Juilliard School and a proud member of Actors Equity Association. He lives in Nelsonville and is the proud parent of a Haldane Elementary School student.



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peggy clements, vice president

Term Expires: June 2023

Peggy Clements has served on the Board since 2015. After earning a Ph.D. in psychology in 2003, she began working as a child development and education researcher. Her work focuses on the use of technology to support teaching and learning, particularly for science and math. Peggy’s son graduated from Haldane in 2016.



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john hedlund, trustee

Term Expires: June 2024

John Hedlund has served on the Board of Education since 2018. He has two children who have been enrolled in the district since kindergarten. John has worked in the financial services industry for 20 years, and started his professional life as an elementary school teacher in Houston, Texas.



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maggie valentine, trustee

Term Expires: June 2024

Maggie was elected to the Board of Education in 2021. She has 21 years of experience working as a financial journalist, from managing different sections of a national business magazine to supervising editorial coverage of the tech sector for a global news wire. Maggie has two children at Haldane Elementary School and often volunteers in their classrooms, as a garden parent and a yearbook advisor.



ezra clementson, trustee

Term Expires: June 2025

Ezra Clementson and his wife Aria (Haldane Class of 2000) raise their two children in Nelsonville and have watched them thrive at Haldane. With nearly 20 years experience in NY secondary public education, 6 years as a faculty union president, current Haldane School Foundation trustee, Little League Softball assistant coach, and stints on the Cold Spring and Nelsonville Planning Boards, Ezra is ready to roll up his sleeves for the Board of Education. Ezra is a steadfast advocate for public education and the Haldane Community.

Catherine Platt

District Clerk, cplatt@haldaneschool.org