Meet O'Sullivan Architects

David is licensed in Massachusetts, New Hampshire, Florida, Rhode Island, New York, and New Jersey. He is a member of American Institute of Architects (AIA) and has over 40 years of experience in both residential and commercial design. He is currently the president-elect of Home Builders and Remodelers of Massachusetts and active with the National Association of Home Builders.

Licensed in three states (and counting!), Erion is proud to be part of OSA’s growth across New England. He describes his work style as meticulous, unrestrained, and relentless, and loves that every project brings a new adventure.
🥩 Post-work ritual: Grilling
🥤 Go-to lunch spot: Fat Larry’s
👨‍🍳 Fun fact: Erion thinks he was a chef in another life
🧠 Advice for newcomers: “Take your time. Ask questions. Take responsibility.”

Mark has been with O’Sullivan Architects for nearly 12 years and is especially proud of the 20+ projects he and colleague Janice Gorman completed for East Boston Savings Bank. He describes his work style as thoughtful, client-centric, and collaborative.
🚴 Post-work ritual: Riding his bike through the woods or painting
☕ Go-to order: Dark roast with cream and sugar
🎨 Fun fact: Mark has climbed Alpe d’Huez on his bike and is also a talented artist
🧠 Advice for newcomers: “Learn to sketch to scale.”

Joseph has been part of O’Sullivan Architects for a year and a half, bringing a work style he describes as focused, adaptive, and reliable. He values OSA’s strong sense of collaboration, where everyone’s ideas are welcomed and teamwork fuels both creativity and learning.
🧩 Fun fact: Joseph can complete puzzles with ease — and he’s also known for being able to climb just about anything!

Olivia has been with O’Sullivan Architects since January 2026, bringing her creativity and enthusiasm to the team. She enjoys being part of the collaborative process and appreciates how OSA welcomes ideas and perspectives from everyone, regardless of role or tenure.
She loves OSA’s team-oriented culture, where collaboration is encouraged and everyone has the opportunity to contribute new ideas.
🚶 Post-work ritual: Long walks, gym time, and spending time with friends
🏯 Fun fact: Olivia has climbed the Great Wall of China!
🤝 OSA favorite: The team’s collaborative spirit and openness to ideas

Donnie has been with O’Sullivan Architects for 12 years, playing a key role in shaping projects across the region. A career highlight for him is leading the redevelopment of the Historic Reading Post Office into a vibrant mixed-use building — bringing new life to a local landmark in the very community where he lives.
He describes his work style as collaborative, thoughtful, and hands-on, and is inspired by OSA’s ability to work with many different clients and consultants to bring ideas from vision to reality.
🧠 Advice for newcomers: “Be proactive and take chances. It’s okay to be wrong — just be willing to learn from it and apply it forward.”
🌅 Post-work ritual: Spending time outdoors with his family
☕ Go-to lunch spot: Nella’s
🔨 Fun fact: Before becoming an architect, Donnie framed houses.
🐶 Team Dogs: Confirmed!

Jonathan has been part of O’Sullivan Architects for 24 years and recently celebrated becoming a part owner of the firm. His design approach can be summed up as “Modern Takes on Traditional Forms,” blending timeless architecture with fresh ideas.
What he values most about OSA is the freedom to explore ideas and the collaborative spirit of the team.
🧠 Advice for newcomers: “Listen carefully but also provide your input.”
🎶 Fun fact: Jonathan plays piano and sings in two bands.
🍜 Favorite lunch spot: Bangkok Spice — his go-to spot right down the street.
🌅 Post-work ritual: With three middle schoolers, free time is rare — but whenever he can, Jonathan unwinds by playing music.

Sara has been with O’Sullivan Architects for nearly 2 years and is especially proud of her work on 57 Mill Street in Woburn, MA — the first and largest interior project of her career. Watching the multifamily development take shape as construction nears completion has been a rewarding milestone.
She loves OSA’s collaborative work environment, where everyone works as a team and welcomes new ideas regardless of role or tenure.
🧘 Post-work ritual: Yoga sculpt classes
🍵 Go-to order: Iced matcha (or chai) latte with vanilla cold foam
🎄 Fun fact: Sara was born on Christmas Day!

Onelda believes the most successful projects strike a balance between practical solutions and inspiring design — a philosophy she carries through every stage of her work. At OSA, Onelda values the teamwork, shared ideas, and the chance to create projects that have a lasting impact.
🌿 Outside of work: Spending time with her family, exploring nature, and sketching to spark creativity.

Since joining O’Sullivan Architects five months ago, Rita has been essential to keeping the office running efficiently, ensuring the team can stay focused on their creative work. She brings an organized, adaptable, and calm approach to every task, supporting projects and processes behind the scenes.

🗂️ Role strength: Organized, adaptable, and calm under pressure
🤝 What she values about OSA: “The friendly, collaborative culture.”
⛰️ Fun fact: She climbed Half Dome in Yosemite National Park
✨ Proud moment: Helping the team operate smoothly every day