top of page

Greg W. Tietjen, Architect, AIA

EducationWashington State University, B-Arch Program

S.U.N.Y @ Delhi, BS Architectural Science & Computer Aided Technologies


Greg has over 26 years of experience managing and detailing high-end residential and commercial projects. He is highly skilled in technical detailing, facade integration, design development, and computer-aided visualization. Before joining SLR, Greg worked at Bates Masi Architects in Sag Harbor as a project architect for six years, working on projects in the Hamptons, NYC, and Massachusetts. He then moved to SLR, Stelle Lamont Rouhani Architects, where he spent 16 years gaining extensive experience and received multiple awards for executing projects with such technical precision.


Greg has also worked as an AOR and Architect of Record, demonstrating his ability to collaborate effectively with other designers to bring their visions to life. He has a strong understanding of the building process and extensive experience in multi-collaborative projects that require working with consultants worldwide to execute projects at a local level, showcasing his adaptability and teamwork skills.




Paul du Plessis, Assc. AIA / NCARB

Education; University of Port Elizabeth - B.Arch / Build Environment University of Cape Town - M.Arch


Paul, a native of Cape Town, South Africa, brings 25 years of international experience with high-end residential, commercial, and mixed-use projects, with a strong focus on sustainable architecture. Beyond his professional life, Paul is a family man, residing in Sag Harbor, NY with his wife and teenage son. His personal interests, including Ocean Sailing, Windsurfing, Adventure Travel, and Photography, reflect his adventurous spirit and well-rounded personality.

bottom of page