Tierney Development Services, LLC, or TDS, is based in Massachusetts and provides Owner’s Representation, Owner’s Project Management (OPM), and Clerk of the Works services to the New England region. Principals Douglas Tierney and Brooks Mostue bring more than 60 years of combined experience in the following roles: construction project manager, architect, owner’s representative, construction site inspector, bank inspections, clerk-of-the-works, real estate broker, and development consultant.

Douglas Tierney

Douglas Tierney has been helping property owners across the United States achieve their project goals for the last 19 years. After graduating from Colgate University, Doug worked in construction contract administration for Mostue & Associates Architects (now Davis Square Architects). In 2008 he moved into direct owner representation when he joined The Community Builders, a national developer of affordable housing. As their Director of Construction for the New England Region, he managed a variety of complex developments over a 6-year period. He has since gone on to serve as Director of Construction for Cambridge Housing Partners, a Denver-based housing developer, and Broder Management, a Massachusetts-based developer of luxury housing and hotels. As a Certified Passive House Builder (CPHB), Doug has a passion for great exterior envelope details, energy efficiency, historic renovations, teamwork, and clear expectations for all team members. He currently lives in Natick, MA with his wife, two children, and dog.

Brooks Mostue, AIA

Brooks Mostue has over 45 years of experience as a registered architect, contractor, real estate broker, and developer in Massachusetts and abroad. He is a founding principal of Mostue & Associates Architects, Inc., and its successor Davis Square Architects, Inc.; The Casali Group, Inc. construction project managers; Pentimenti LLC and Gibson & Quincy, LLC real estate developers; and The China Vision Project. Brooks' work spans a broad range of academic, corporate, and residential projects, many of which involve historic and architecturally significant buildings. He is enthusiastic about affordable housing, energy efficiency, and environmental protection. A graduate of Harvard College and the Harvard Graduate School of Design, Brooks has taught and participated in design studios at Harvard, and other schools in Boston and Rhode Island. He has volunteered on building committees for the Town of Lincoln, MA, and is the past president of the Board of Trustees for Farrington Memorial. Brooks has restored four of his own homes of historic significance and is currently renovating a house with one of his three daughters. Brooks and his wife Patty reside in Lincoln, MA.

John Cavacas

John Cavacas, CDT, FMA, is a seasoned manager with over 30 years of experience in Owner’s representation. In addition to construction project management, John’s expertise extends to estimating, scheduling, constructability analysis, contract documents (CDT), facilities management (FMA), and real estate sales (license #0761231). Prior to joining TDS, John was the Construction Representative for Colliers International for the new Cape Cod Technical High School. He is a proud graduate of Southeastern Massachusetts University's (UMASS Dartmouth) Construction Management program. John lives in Centerville with his wife Marcie.

Melanie Coo

Melanie Coo, RA, has been a licensed Architect for over 20 years, with extensive work in affordable and multifamily housing. A graduate of Wellesley College, and with a Master of Architecture from MIT, Melanie’s career includes large multi-unit new construction and rehabilitation projects, as well as small custom retail and residential projects. With Next Phase Studios, she was an associate with the team building the Genzyme Center – among the first LEED Platinum certifications in the country for a large commercial building. During several years with Mostue & Associates (now Davis Square Architects), Melanie was promoted to Senior Associate, managing teams on many affordable housing projects. Her several awards include a Boston Society of Architects’ Design Award, an Energy Star award, and a 2009 National Housing & Rehabilitation Association “Timmy” award for best historic rehabilitation. Most recently she has been overseeing construction as an Owner’s project manager for Acorn Holdings. Melanie has renovated 3 of her own homes, including an appearance on HGTV. Melanie lives in Concord, MA with her husband, 2 teen sons, and many pets.

Nathan Dalke

Nathan Dalke joined TDS in 2021 after 12 years with the Design and  Construction Department of The Community Builders. At TCB, he acted as  full-time Clerk of the Works on site for several large rehabilitation  projects before being promoted to Construction Manager,  and later Senior Construction Manager, for both new construction and  occupied rehab projects in the greater Boston area. During his time with  TCB, Nathan worked on several company-wide initiatives, including their  Climate Taskforce focused on identifying and implementing Sustainability and Resiliency programs within specific  projects. He also piloted an Enhanced Capital Needs Assessment process  to ensure proper Sustainability and Resiliency goals and initiatives  were being identified and addressed during early  Project Scoping. Nathan is a LEED Accredited Professional, and will receive Passive House Certification in 2022. He holds a Bachelor's Degree in Architecture from the University  of Arkansas’ Fay Jones School of Architecture. Nathan is an aspiring carpenter, outdoorsman, gardener, and avid cyclist. He lives in Hyde Park, MA with his wife and two children.

Nick Munkenbeck

Nick Munkenbeck joined the TDS team in 2021, subsequent to 7 years of private practice consulting affordable housing developers on construction projects in the Boston area. Before receiving a Bachelor’s Degree in Architecture from Roger Williams University, he worked as a machine operator and Yard Foreman in the relocation of six triple-decker apartment buildings and later as a “rough-neck,” piping drill rigs for geo-thermal wells around Trinity Church in Copley Square. While a designer and assistant project manager at The Architectural Team in Chelsea, he helped complete the adaptive reuse of Boston’s Historic Baker Chocolate Factory and other mill buildings. Nick has worked as Clerk of the Works for Roxbury Tenants of Harvard on Mosaic on the Riverway, their high-rise project in the Longwood Medical area; Madison Park Development Corporation on the Historic Tropical Foods building; and the Lena New Boston, creating 188 mixed income home ownership and rental opportunities. Nick is a Certified Passive House Builder (CPHB) and lives in Wayland, MA with his wife and children.

Peter Rex

Peter Rex came to TDS after attending Colgate University. At Colgate, Peter earned a Bachelor of Arts degree in Environmental Geography. He has had internship experience with Davis Square Architects and the Planning Department for the Town of Andover, MA. Peter has participated in research studies which explore regional transit-oriented development and evaluate municipal vulnerability to natural hazards. He has also completed graduate coursework through UMass Boston’s Center for Rebuilding Sustainable Communities after Disasters. A Certified Passive House Builder (CPHB), Peter brings a passion for energy efficiency and combatting climate change through green building. He currently lives in Cambridge, MA.

Ei Herman

Eli Herman has 20 years of experience in the construction industry, ranging from carpentry and cabinetmaking to extensive work in sustainability and energy efficiency to managing large scale new-construction and renovation projects. After earning his MDS in Sustainable Design from the Boston Architectural College, Eli went on to earn his CEM, LEED AP-Homes, and PHIUS Certified Builder accreditations. He has a passion for high-performance buildings and a focus on helping owners and developers get the best bang for the buck through whole systems design. He has fully renovated three of his own homes in addition to thousands of units of housing. He enjoys gardening, disc golf, and outdoor adventuring. He lives in North Reading with his wife, daughter, puppy, cat, and two rats.

Amy Bloom

Amy Bloom is a Registered Architect and LEED Accredited Professional with 20 years of experience in design and construction management. She graduated from the Rhode Island School of Design school of Architecture in 2003. Amy worked for Lieb Architects, Architects and Associate Designers, and Davis Square Architects prior to developing her own Woman-Owned (WBE) firm, Amy Bloom Architecture, based out of Andover, in 2013. Amy has successfully completed over 90 projects in and around the Merrimack Valley focusing largely upon historic renovations, accessibility upgrades, affordable housing, single and multifamily housing, and light commercial tenant fit-outs. She has been an active member of the Andover Historic Preservation Commission since 2021 and joined TDS as a Project Manager in 2023. Amy enjoys candlepin bowling and is the top female bowler in her league.

Prathyusha Dammu

Prathyusha comes to TDS as a Clerk-of-the-Works currently pursuing her Master of Architecture degree at Boston Architectural College. She earned her Bachelor of Architecture from the Jawaharlal Nehru Architecture and Fine Arts University in Hyderabad, India. She worked as an architectural intern and a designer before coming to the U.S. to continue her studies. Prathyusha is very involved in student life, having served as a Teaching Assistant for BAC’s Summer Academy, President of the BACultural Group, and Chair of Events for National Organization of Minority Architectural Students (NOMAS) at BAC. She pays keen attention to detail as she ensures efficiency, budget, and quality control on her projects. As she expertly balances work and school, she also enjoys watching Formula One racing, baking, and sharing the delicious results.

Pam Maryanski

Pam Maryanski serves as an Assistant Project Manager at TDS. A graduate of Smith College and former classroom teacher, she brings keen organization, communication, and relationship-building skills to her work. Her interests in architecture, affordable housing, and project management led her to this role. She is currently serving on her town's Community Development Board and pursuing further professional development in the fields of construction and business. Pam is driven by a desire to increase equity in access to housing in Massachusetts and is grateful for the lovely home she and her daughter share in Medford.

Scott Drumm

Scott Drumm’s construction career has taken him through both residential and commercial projects across New England. Scott founded his own residential building company in 1997 and began to build his reputation for delivering exceptional craftsmanship. Scott later served as a clerk-of-the-works for local architects and evolved his skill set into the commercial world. Rooted in quality, respect, and consideration for his team, Scott’s career grew into project management. He has overseen multi-million dollar projects for clients including MassDOT, Baystate Health, and Haynes Development, including medical labs and a parking garage for the Department of Veterans Affairs. Scott joined TDS in 2023 as a project manager. When he isn’t building for work, he is renovating his 1780’s early Colonial home in Wilbraham, MA, with his wife and four daughters.

Andrew Sansom

Andrew Sansom is a Registered Architect, LEED Accredited Professional (AP), and Certified Passive House Builder (CPHB). He has spent more than twenty years in the commercial real estate services sector advising clients on their real estate and occupancy planning. Before Andrew came to TDS, he led design and construction for all commercial tenant space in a new 1 million sf LEED Platinum Certified office tower in downtown Boston. His career has focused on representing both owners and occupiers of commercial, industrial, and multifamily residential real estate. Andrew is driven by a desire to help clients achieve their goals for making their buildings more sustainable and lessening their impact on the environment. He is particularly interested in the intersection of sustainability and equity in addressing the New England region's housing crisis. Andrew lives and works in Winchester with his wife and two children, and when not on site or advising clients, he enjoys flying airplanes as a private pilot, traveling, hiking, and fly fishing.

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