Mark J. Herbkersman, AIA
Director of Architecture

Bringing a wealth of experience to his position of Director of Architecture, Mark Herbkersman is highly skilled at providing clear, organized solutions to complex problems through a creative and collaborative process. Mark’s diverse background in architecture and design encompasses a wide variety of public as well as private project types, including mixed-use, placemaking, hospitality, commercial office space, master planning, multi-family residential, and historic renovation. Previous project responsibilities included Director of Design, project architect, project manager, and principal-in-charge. Additionally, Mark’s design work has been published in several professional trade journals, and he has been featured as a speaker at professional conferences regarding architectural design, professional practice standards, and urban economic development.

Diane Abate, RA
Architect, Project Manager

Diane Abate brings over 20 years of experience in the field of design and architecture. She earned her Bachelor of Science: Architecture and Bachelor of Architecture: Architecture degrees from CUNY Spitzer School of Architecture, graduating with honors and receiving an Excellence in Design and Best Thesis Project awards. Prior to joining S&A, Diane was an Associate with Peter Gisolfi Associates, located in Hastings-on-Hudson, New York. Diane thrives on applying her extensive knowledge of project management, building design, and construction document production to her new projects, and is excited to play a role in the design and development of surroundings she now calls home.


Tim Barnett
Architect II, Job Captain

Tim Barnett’s interest in community-focused design, historic revitalization, and New Urbanist thinking led him to join Stevens & Associates in 2021. He holds a Master of Architecture and a Certificate in Public Interest Design from Portland State University, and a Bachelor of Science in Architecture from Wentworth Institute of Technology. His previous experience as an Architectural Designer includes design of affordable housing and multi-family projects in Greater Boston, New York, San Diego, and Portland, Oregon. From new construction to adaptive reuse, Tim enjoys discovering each site’s unique opportunities and potential. Tim is currently focused on commercial and residential projects for S&A as he works toward receiving architectural licensure. He is excited to be part of this talented team and looks forward to building stronger communities.