Board of Directors

The Stone Trust has an active board including professional dry stone wallers and members of other professions who are interested in dry stone walls.  If you are interested in serving on the board of directors, please contact us for more information.

Board Officers

Martin Beevers, President

Dickson, TN

A British aficionado of American culture becomes an expat waller in Tennessee

Martin Beevers is a Level 2 DSWA-certified dry stone waller who lives in the Nashville area. He joined the Stone Trust Board of Directors in 2021 and also serves on the Programs Committee. He runs a professional dry stone walling business in the Nashville area, calling himself Old England Rock Walls LLC.


Daniel Morales-Walsh, Vice President

South Portland, ME

Dan joined the board of The Stone Trust (TST) in January 2020. He has been working with stone since he was fourteen years old when he also began helping his father with his general construction business. Dan is a Dry Stone Walling Association of Great Britain (DSWA-GB)-certified Level 2 Intermediate waller and instructor. He is the proprietor of Maine Stone Scapes in South Portland, Maine. He currently incorporates dry stone construction around new and remodeled homes in Maine, including retaining walls, entrance ways, steps, and patios.

Dan worked with his father throughout his childhood and has always felt at home on a job-site. As his dad’s business shifted more towards stone work, Dan began to realize that his love of puzzles, creating structures, and working outdoors all came together in his stone craft. Even after college, and a degree in exercise physiology, Dan surprised no one when he decided to commit to a career in stone work.

Daniel Morales-Walsh, Board Vice-President

Duncan Murphy, Secretary

York, ME

Duncan comes to the board with a passion for designing and building, along with the can-do attitude of someone who does his own work. For example, without any formal instruction in stone work, he laid the patio at his home in York, Maine. He appreciates, though that “stonewall building is an incredible art.” Duncan says that if it makes sense in the context of his new business, over time he’ll pursue Level 1 certification.

In 2019, finding himself at an inflection point, Duncan left a 25-year career in which he adapted a vocation for teaching to leading professional education in a global technology corporation. Time to abandon the long commute and international travel in order to rediscover his roots and settle down. Time to slow down a bit, pay more attention to physical fitness, and spend more time with his wife and two children. A New England seacoast native, Duncan and his family settled in Maine, a venue with which he is familiar as a long-time surfer who follows the waves.

Duncan Murphy, Board Member

Ed Marrinan, Treasurer

Bronxville, NY

Ed joined the board of The Stone Trust (TST) in January 2020. He has spent his entire professional career working in finance, but when he took an introductory course with TST in 2014, as he says, “I was bitten by the walling bug.”

Ed was born in New York City and raised in the Westchester suburbs. After graduating from Regis High School in New York City, Ed attended Union College in Schenectady, New York where he majored in Economics and later earned a Master’s in Business Administration (Finance) from New York University. In 1985, Ed joined Keefe, Bruyette & Woods (KBW) where he specialized in the analysis of global banking companies. Five years later, Ed was asked to relocate to London to establish KBW’s first international office, where a two year initial commitment ended up extending to nearly 14 years. In 2004, Ed and his family returned to the United States in order for Ed to work for JPMorgan Securities in New York. He is currently employed by HSBC Securities, providing investment advice to institutional investors.

Ed Marrinan, Board Treasurer

Amy-Louise Pfeffer, Board Member & Executive Director

Bellows Falls, VT

With great pleasure and considerable surprise, I stepped into the role of executive director in the fall of 2019, bringing a variety of experience in nonprofit and small business development, as well as in public education. The board tasked me to lead the Stone Trust through a transition from growth to maturity by focusing on two priorities: governance and operations. Previous engagement in not-for-profit organizations—as a consultant, as a board member, as a professional intern, as a collaborative program coordinator, and as a volunteer—furnished different lenses from which to evaluate the Stone Trust’s needs and effectiveness in accomplishing its mission. Since then, collaboration with founders, board members, staff, and members of the professional walling community has enabled the spread of high-quality training and certification in the art and craft of dry stone walling from the Northeast to the Rockies!

Amy-Louise Pfeffer, Board Member

Board Members

Michael Barwell, Board Member

Hopkinton, NH

When he retired in 2018 from four decades as a journalist and public relations specialist, he vowed not to rest — or rust.

During the next two years he became a Master Gardener and Natural Resource Steward through the University of NH. He also took five Stone Trust workshops in basic walling, retaining walls, historic stone wall rebuild, flat work and stairs and steps. He began working almost full time for his son John’s landscape business Perfect North Lawncare in Concord, NH, doing design-build gardens, walls and flat work for clients.

He’s currently the chair of the Education Committee for the NH Landscape Association. The Stone Trust joined a retaining wall demonstration project during the NHLA’s annual Field Day in September 2023, coordinating with Peter Ryder and other instructors. It was a huge hit and a number of NHLA members signed up for workshops.

“My professional career spans Gutenberg to Zuckerberg,” he quips. “The first daily newspaper I worked for had a functioning Linotype machine using hot lead type. I was an early user and advocate for desktop publishing and other emerging electronic media.

“I’m not a professional waller but I love working with stone. And we have happy clients. Now, I want to help The Stone Trust maximize its potential in marketing/communications and grow.”

Michael Barwell, Board Member

Bill Burgess, Board Member

Herndon, VA

Bill began his journey as a dry stone walling hobbyist in 2021 upon retiring from a 35-year career in federal service. He earned his DSWA Level 1 certification in 2023 and aspires to earn his Level 2 certification at some point in the not-too-distant future. Having completed a number of Stone Trust workshops in PA, NH, and VT, he is looking for opportunities to visit the other Stone Trust training sites in the next few years. Bill lives in Northern Virginia.

Bill Burgess, Board Member

William Cremins, Board Member

Spring City, TN

William’s bio is forthcoming. Stay Tuned!

William Cremins, Board Member

Hilary Dees, Board Member

Lafayette, CO

Hilary started working with stone on trails in 2012 and has traveled and worked across New England and the West, specializing in utilizing rigging systems to quarry and move stones at remote job sites. In recent years she has shifted her focus to teaching and training, specifically working with trail crews to incorporate traditional dry stone techniques into the trails trade. Hilary is a DSWA-GB certified Level 2 waller and instructor.

Hilary Dees, Board Member

Kevin Lair, Board Member

Winterset, IA

Kevin Lair is an interdisciplinary designer, artist, and educator. He has incorporated stone into design/build projects and in teaching Material Intelligence at Iowa State University. He is an avid supporter of stone for its vibrant character and ecological value for the built environment. Lair is on a journey for DSWA certification. His vision includes bringing stone workshops to Iowa, design professions and academia. The Material Intelligence class has been working on a project using stone at the site of a former one-room schoolhouse. The site continues in the spirit of education to help foster interest in stone in new generations of architects and designers.

He holds degrees in Fine Arts and Psychology from Drake University and a Masters in Architecture from Harvard University. His academic appointments include Iowa State University, Syracuse University and Indiana University. Lair founded the Westbrook Artists’ Site (WAS) and currently is the director. The Westbrook Artists’ Site (WAS) is a post-industrial rural site located on 550 acres of land near Winterset, IA. From 1996 to 2006, WAS operated as an artist-owned venue for interdisciplinary art, design and architecture and then relaunched in 2011. WAS deepened its mission, focusing on the history and condition of the land itself, to provide an experiential laboratory for exploration of the post-industrial rural condition.

Kevin Lair, Board Member

Brian Post, Board Member

Chester, VT

Brian started building stone walls when he was 10 years old, and has continued working with stone ever since. Brian is a licensed Landscape Architect, and a certified Master Craftsman with the Dry Stone Walling Association of Great Britain (DSWA-GB). Additionally Brian is also a certified dry stone wall Instructor and Assessor (Examiner) with the DSWA-GB. He has worked closely with The Stone Trust since 2012 as a board member, President, Executive Director, and Director of Education and Training. Starting in 2022 Brian became the DSWA-GB North American Coordinator.

Brian has taught well over a 100 workshops in the past decade and was instrumental in creating many of the curriculums taught at The Stone Trust. Brian’s background and experience in landscape architecture, historic masonry restoration, and other building trades gives him a tremendous depth and breadth of knowledge. Brian has worked walls throughout New England, as well as in the United Kingdom, Spain, Canada, and as far west as New Mexico.

In 2010 he started his own firm, Standing Stone LLC, which focuses on large and complex dry stone work projects, masonry restoration, and landscape construction. Brian now regularly leads crews of 8 to 20 certified wallers on large scale dry stone projects with a fleet of excavation equipment and a full time year round staff of 4 DSWA-GB certified wallers.

Board Member Brian Post