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Ryan MacArthur, Owner + Principal of Design
Joined in 2010
Ryan spent his formative years traveling the world before eventually settling on Cape Ann. As the owner of Treehouse, he champions a holistic, design-build philosophy that values the interplay between thoughtful design and hands-on craftsmanship. With a strong background in contemporary vernacular architecture and interiors, Ryan brings a distinct perspective to every project the studio undertakes. His leadership is rooted in a deep understanding of both the creative and practical aspects of the building process. When not at the office or with his family, Ryan can often be found braving the cold Atlantic surf alongside the local community.
Ryan is a registered architect licensed in Massachusetts.
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Patrick Herlihy, Owner + Principal of Construction
Joined in 2012
Originally from Cape Ann, Patrick pursued an education in marketing and communication in Vermont. Growing up he spent winters alpine ski racing and summers competitively sailing, later becoming a youth sailing instructor at the Sandy Bay Yacht Club. Patrick settled in his native Rockport to raise a family and entered the building trade as a carpenter, specializing in the restoration of old homes and timber-framed buildings. Project management was a natural progression for Patrick, whose instincts for collaboration and communication with clients, architects, designers, and subcontractors are key to the success of every project. As an owner, he is deeply committed to fostering a culture of teamwork and ensuring each project is executed with care and precision. When not on Treehouse time, you can find Patrick fishing the waters of Cape Ann, mountain biking in Dogtown, or spending time with his family and friends.
Massachusetts Construction Supervisor License CS-107441.
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Tim Thurman, Founder (Retired)
Growing up on both coasts, Tim made elaborate treehouses with his friends. Not the typical back yard variety, but deep in the woods, built with found and salvaged materials, and unsupervised by adults. Those empowering experiences, together with high school residential construction jobs, sparked an interest in architecture. At architectural school, where employment was part of the curriculum, Tim worked for large and small architectural firms in Boston, and ultimately with a design-build firm on Boston’s North Shore. During the economic downturn of 1990, a Clinton era program, “The Enterprise Project,” was developed to support the creation of small businesses in hopes that they might stimulate the sluggish economy. It was through this program that the business plan for Treehouse Design was born.
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Ellen Levine, Architect
Joined in 2003
Ellen first became interested in architecture in high school. Drawn to coastal villages, she centered her career on residential design. Passionate about sustainable design strategies that result in energy efficient and comfortable homes, Ellen brings a green building perspective to all projects she tackles. Ellen thrives in the entire design process—from initial client meetings, to organizing spaces that fulfill their vision, to presenting projects to local permitting boards. Outside of the office you might find Ellen spending time with her family, tending to her garden and chickens, practicing yoga, or rocking out at a local music venue.
Ellen is a registered architect in Massachusetts with three decades of practice experience.
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Lynn Quagliato, Designer
Joined in 2021
Lynn joined Treehouse in 2021. A 2016 graduate of Wentworth, where she studied architecture, she is now working on an advanced degree at the Boston Architectural College. She is an energetic architect-in-training with a passion for creative design. Her background in art and technology gives her a unique insight to modern design strategies. Lynn has lived in Massachusetts all her life, but is slowly migrating from Boston’s South Shore to the North Shore. Her hobbies include playing with her cat, painting, digital art, and baking.
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Kate Martin, Project Designer
Joined in 2023
Kate studied at the University of Virginia, where she received both her bachelor’s and master’s degrees in architecture. Her love of historic architecture was sparked during the year she spent at Edinburgh University in Scotland between high school and college. During her career, she has worked as a high-end residential designer as well as a project manager on the Wynn Boston Harbor. She is currently pursuing her architectural license. Kate moved to Salem in 2017 and completely fell in love with the city, and with the entirety of the north shore area. She and her husband bought an old house in Salem and are working to restore it. They have a little rescue dog named Witch Hazel who is often found trampling the plants in Kate’s beloved garden.
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Amanda Lennon, Senior Interior Designer
Joined in 2024
Amanda grew up on the North Shore and now lives in Beverly, bringing a strong local connection to our Treehouse team. With a Journalism degree from the University of Rhode Island and a Master’s in Interiors from Suffolk University, she has nearly 20 years of experience in Boston-area interior design. Her inspiration ranges from the natural world to modern art, always grounded in a thoughtful, client-focused approach. Outside the studio, Amanda enjoys hiking, museums, historic homes, and travel and is currently learning Spanish.
Amanda is a NCIDQ certified interior designer.
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Meg Taraska, Interior Technical Director
Joined in 2009
From astrophysics to interior design, Meg’s intellectual curiosity and creativity led her to Treehouse. She graduated from MIT with a BS in Physics, and worked as an Information Architect for 10 years at a start-up company, and then at IBM. More recently, Meg attended the North Bennet Street School for furniture making, and then the Boston Architectural College to study kitchen and bath design. She has resided on Cape Ann for over a decade and loves creating thoughtful interiors that bring joy to each client. In her free time, Meg loves running, cooking, gardening, and snowboarding.
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Julia Roso Mares, Interior Designer
Joined in 2023
Julia comes to work at Treehouse Design from Valencia, Spain. She graduated from the Polytechnic University of Valencia with bachelor and master degrees in architecture, where she discovered her passion for mid-century architecture. She worked in a prestigious studio called Ambau, where she mixed traditional and contemporary architecture to respect historic buildings. She has a European vision of architecture and design. She came to the country of four seasons for love. Julia and her husband, Santiago, have a rescue dog named Gazpacho, after a delicious Spanish tomato soup. Julia enjoys discovering charming small towns, visiting iconic houses, local farms, and markets where there is always something to learn.
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Jeff Shelton, Senior Project Manager
Joined in 2015
Jeff grew up on the plains of Oklahoma, earning degrees in geography, geology, and a master’s in GIS from Oklahoma State University. Throughout his academic journey, he nurtured a lifelong passion for woodworking.
He brings extensive experience and a strong record of leading large-scale construction projects from start to finish. Jeff is skilled at project planning, budgeting, multidisciplinary team coordination-consistently delivering projects on time, withing budget, and to the highest standards. His deep understanding of construction processes and industry regulations is key to keeping projects running smoothly from concept to completion.
When he’s not in the office or in the field, Jeff enjoys spending time with his family, boating around Cape Ann, and catching as many sporting events as possible.
Massachusetts Construction Supervisor License CS-113339.
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Jesse Fallon, Project Coordinator + IT Manager
Joined in 2010
Jesse believes that we humans and animals share more similarities than differences, and recognizing and acting thus makes us all feel more ease, love, and safety in our lives. In that spirit, Jesse is delighted by the level of care Treehouse delivers to our clients, their neighborhoods, the larger community, and our fellow team members. With a degree in engineering from UC San Diego, and training in carpentry, natural building, yoga, and meditation, Jesse brings a myriad of skills to the team. Jesse’s other interests include time outdoors in nature, dancing, and a good book.
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Marie Cahoon, Office Administrator
Joined in 2022
Born and raised on Cape Ann, Marie studied history, English and art history at the University of Vermont. Before joining Treehouse in 2022 as our new Office Administrator, she worked for 9 years in a Gloucester law office that offered real estate and estate planning services. She is enthused to put her organizational skillset to work in our design-build workplace and to support and collaborate with a group of dedicated creators of sustainable, heirloom architecture. Marie enjoys spending time with her husband, two daughters and dog, thrift shopping, trips to local farms, cooking and reading.
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Jon “Sid” Sidlowski, Shop Manager + Senior Cabinet Maker
Joined in 2010
“I can build anything if it’s out of wood.” Sid worked as a finish carpenter in the larger Cape Ann area for 30 years before joining the Treehouse team. As the leader and heart of the custom cabinet shop, Sid’s dedication and willingness to take on any project is contagious. He excels at figuring out how to build one-of-a-kind pieces. Born and raised in Gloucester, Sid grew up playing in the quarries of Lanesville and dirt biking in the woods of Dogtown. In his time off, Sid can be found on his motorcycle with his wife Cathi, exploring the highways and back roads of New England and beyond. Sid and Cathi have two grown children, Sara and Ryan.
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Fraser Watson, Specialty Finish Carpenter
Joined in 2024
With a unique path from classroom to craft, Fraser brings a thoughtful, hands-on approach to woodworking. After more than a decade teaching high school English and woodshop, he transitioned full time to the trades, spending summers apprenticing with local carpenters to hone his skills. In 2020 he co-founded Timber + Salt Inc., a custom sawmill and woodworking business rooted in sustainability and creative collaboration.
His experience spans timber framing, general and fine carpentry, and custom furniture design. A creative problem solver at heart, Fraser has worked closely with clients to design and build pieces that reflect their values, needs, and spaces, always with strong attention to detail and craft. At Treehouse he brings this same energy and expertise to every project.
Fraser holds a Master’s in Special Education from Simmons College and a B.A. in English Literature from Saint Michael’s College where he captained the men’s soccer team. He lives in Gloucester with his wife and two young boys, who keep them running.
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Scott Tyrrell, Cabinet Maker + Finisher
Joined in 2009
Scott’s many talents include construction drawing analysis, cabinet and furniture fabrication, and all facets of cabinet finishing. In addition to a degree in architecture and construction management, Scott has 26 years of experience in cabinet making. For 13 years, he ran his own construction company specializing in rehab and historical preservation. When not on the job, Scott can be found on the water racing stand-up paddle boards, outrigger canoes, or wakeboarding. In winter, he can be found in the mountains skiing, snowboarding, or snowshoeing. Scott and his wife, Amy, have a rescue pup named Izzy and two rescue cats.
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Zack Mark, Senior Cabinet Maker
Joined in 2014
Zack grew up exploring the woods and coast line of Cape Ann, always wanting to be connected to the environment. He studied sustainable agriculture in college and worked on small organic farms in Western Massachusetts and Essex, raising livestock and growing vegetables. He soon realized that his real passions were woodworking and furniture design. Zack began at Treehouse as a shop assistant and is a valued member of the cabinet-making team. On weekends, you can find him rock or ice climbing in the White Mountains or paddling around Cape Ann in his kayak.
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Thomas Hall, Senior Cabinet Maker
Joined in 2008
Woodworking is Tom’s passion, and he generously shares his skills with the cabinet crew. Tom spent several decades in construction and land development in Eastern Massachusetts and The Islands. He and his wife, Linda, have owned a number of antique homes dating from as early as 1680 and have taken great joy in refurbishing them with their two daughters. During his leisure time, Tom designs and builds furniture, often using colorful scraps of wood from the Treehouse woodshop. His pieces are on display on his websites: thosrhall.com and tdhallassoc.com.
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Bob Nasser, Master Carpenter + Site Super
Joined 2024
Bob got his start in the Gloucester Vocational Carpentry program in the early ’80s, laying the foundation for a lifelong career in building. Over the next two decades, he honed his craft working with contractors across Cape Ann, mastering everything from framing to finish work. He later spent 15 years as a union carpenter with Local 33, contributing to some of Boston’s most high-profile construction projects.
Through it all, Bob found himself most drawn to the fine details, the precise, hands-on work that brings a home to life. At Treehouse, he focuses on finish carpentry, where his experience and attention to detail shine.
Outside of work, Bob enjoys time on the water, fishing and boating with family and friends along the North Shore.