Architecture. The Necessary Art.

We are a New York based architecture and interior design firm with a 40-year history of award-winning modern design.  Located on Long Island, New York, our interdisciplinary design studio focuses on all phases of architecture and interior design projects, from conception through completion, across all programs and typologies.


Founded in 1980, By Mark Stumer and Tom Mojo, our firm has been a consistent leader in the development of modern architectural trends from Long Island and New York City, down to Miami and Palm Beach for the past four decades.  Now in our 41st year, we proudly continue to provide our clients with the thoughtful, dynamic and creative architecture and interiors we've become known for.

Most Recent Work

Park Avenue Apartment


Upper West Side Apartment


Dune Road House


Fort Pond House

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Rolling Hill House

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Holocaust Museum Auditorium

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Kings Point House

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Englewood Cliffs House

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Roslyn House

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"Every time I enter my house, I’m amazed that I live here" 

- Kamran Malekan

"MSA transformed our first apartment into a beautiful and functional space. Now as we embark on the transformation of our first home there was no one else we would think to entrust but the MSA team. Between their creative and innovative concepts, attention to detail in plans and phenomenal customer service their architectural and interior teams are second to none" - Dari Horowitz

"The team is extremely professional, knowledgeable and with great work ethics. On one of our meetings they invited us to utilize their state of the art technology to virtually see and walk into the new designed space via Oculus VR goggles to get an idea what the finished project will look like!" - Nazanin Amiran 

"Their innovative designs are translated into highly detailed construction drawings. Their entire team is always responsive and professional. We look forward to working with Mojo Stumer Associates again in the near future" - Ron Horowitz