At SLS, we believe that an exceptional education will shape not only what you know, but who you become.
You’ll discover a love of learning, grow in compassion and character, and build the confidence to lead and the courage to serve. These values guide all we do—in classrooms, on stage, in labs, on the field, and in how we treat one another.
At SLS, you won’t only prepare for what’s next. You’ll discover who you are and how you can make a meaningful difference. Along the way, your teachers, advisors, and coaches will be your guides—challenging you, supporting you, and encouraging you to grow in ways that matter.
Come with questions. Leave with a sense of what’s possible. I hope you’ll spend time exploring our website—and even better, visit our Hilltop campus and experience this community for yourself.
We can’t wait to meet you.
Warmly,
Mary Carter
Head of School
Meet Hefty & Pudge!
Your Hilltop tour is not complete until you’ve crossed paths with Hefty and Pudge—our resident charmers, nap enthusiasts, and professional treat sniffers. Whether they’re greeting students at the front entrance, sprawling across the Commons like they own it (they kind of do), or stealing hearts on the sidelines, these two know how to make an impression.
They remind us to slow down, savor the moment, and never underestimate the power of a good belly rub.
Stop by campus and don’t be surprised if they greet you first. Hefty and Pudge love visitors—and they’re always recruiting new fans.
About Mary Carter
In October 2021, Dr. Mary Halpin Carter, Ph.D. was named SLS’ new Head of School. Dr. Carter brings extensive experience from The Derryfield School, where she served as Head of School and held various leadership roles.
Students should feel deeply respected at school. I want each child to know, you are not just important to us and your family—the world also needs you to contribute and serve.
Education & Experience
- University of New Hampshire
Ph.D. in Education; Concentration in School Leadership.
Dissertation: Independently Innovative: Teachers and Change in Successful Schools. - Columbia University
Klingenstein Fellowship for excellence in independent school teaching. - Harvard Graduate School of Education
M.Ed. in Teaching, Curriculum, and Learning Environments. - Dartmouth College
A.B. in History with a focus on American intellectual and cultural history.
Dr. Carter joined The Derryfield School in 1997. Prior to becoming Head of School in 2012, she served in various positions, including Assistant Head of School for Faculty and Academic Programs (2010-2012), Dean of Faculty and Academic Programs (2008-2010), Head of Upper School (2006-2008), Academic Dean (2000-2001), and Director of Admission (1997-2000).
Dr. Carter left Derryfield in 2001 to "raise three little people" with her husband, Chris - children Louisa (25), Polly (23), and Martin (21) - but was enticed back in 2006.
Prior to Derryfield, Dr. Carter worked at Newton North High School in Newton, MA as a history teacher and tennis coach. Earlier, she served as Director of Admission and Financial Aid, history teacher, and coach at The Pingree School in South Hamilton, MA. Dr. Carter began her career at Harvard-Radcliffe Colleges in Cambridge, MA, implementing young alumni giving strategies as Assistant Director of the Harvard-Radcliffe Fund.
Dr. Carter's Installation Celebration
Mary has had an undeniably fantastic impact on SLS. She has identified this magical intersection where, in her own words, 'school can be challenging and joyful.
- Christopher Rosow, Board Chair (2023-2025)
See Dr. Carter’s formal installation (and learn about the interesting history of SLS):
