Urbahn Architects is led by a partnership born of cooperation and a respect for each individual’s varied experience.  The principals are guided by a common commitment to service, innovation, prosperity, and the hands-on approach they bring to every project.

Donald E. Henry, Jr., AIA, LEED AP

Managing Principal

Donn Henry joined Urbahn Architects in the early 1980s and has been an officer since 1996. Donn directs Urbahn’s public safety work, as well as major civic infrastructure projects. With over 25 years of experience, Donn has completed the programming, planning, and design of numerous complex institutional facilities throughout the tri-state region. His management style is characterized by an unyielding commitment to both the project and client, evidenced by his focused stewardship of schedule, budget, and quality.


Donn is a recognized expert in planning and design of secure facilities, including Urbahn’s Federal Metropolitan Detention Center in Brooklyn, NY, Correctional Medical Center in Bayamon, PR, and Public Safety Communications Center in Jersey City, NJ. He is an advocate for passive security within a project’s planning and architectural design, but is also an expert in implementing security technology, including CCTV, touch-screen controls, electronic locking, intrusion systems, and perimeter detection.


Donn holds a Bachelor of Architecture degree from the New Jersey Institute of Technology. He is a registered architect in New Jersey and New York, as well as a LEED Accredited Professional.

Natale V. Barranco, AIA, LEED AP


With over three decades of experience, Nat Barranco directs Urbahn’s Higher Education and Transportation groups. Nat is well known for his hands-on management approach which allows him to bring in our most challenging projects on time and within budget. He has completed numerous rail transit stations, university housing, academic research and science buildings, and healthcare facilities throughout New York and New Jersey.


One of Nat’s most valuable skills is finding accord among various constituencies within multi-faceted client groups. Nat draws on his extensive experience and knowledge of building systems, construction practices, and project-delivery methods to guide large multi-disciplined teams toward innovative, sustainable, constructible, and cost effective solutions. Nat immerses himself in each of his projects, ensuring the highest level of quality and attention to design, construction administration, schedule adherence, cost control, and code compliance.


Nat has been a principal at Urbahn since 1988. In addition to his project work, he also serves as Urbahn’s Chief Financial Officer. Nat received his Bachelor of Architecture from Pratt Institute, is a LEED Accredited Professional, and is a registered architect in New York, New Jersey, and Connecticut.

Rafael Stein, AIA


Rafael, an officer at Urbahn since 1996, was named Managing Principal in 2009. For the past 15 years, he spearheaded Urbahn’s business development efforts. This role has fostered in Rafael a keen understanding of client needs, allowing Urbahn to respond with a consultant team and technical approach that can meet, and surpass, their aspirations for a project.


In addition to his corporate duties, Rafael is involved in all aspects of architectural practice, from planning and design through production and construction. His project experience has focused on the k-12, higher education, and transportation sectors. Rafael’s particular strength is his talent for taking on projects whose goals require the development of original methodologies. Rafael led Urbahn in its initial fast-track Design/Build projects, and has directed the work effort for a variety of major institutional Capital Planning programs.


Rafael received his Bachelor of Architecture degree in 1988 from The Cooper Union for the Advancement of Art & Science. He is a registered architect in New York and New Jersey.

Ranabir Sengupta, AIA, LEED AP


Ranabir Sengupta is a talented architectural designer and master planner. He has guided the planning and design on numerous projects for Urbahn’s educational, transportation, and institutional clients. Ranabir’s projects have been featured in Architectural Record, Architecture + Design, Restoration Directory, and the Journal of the Indian Institute of Architects.


Ranabir received his Bachelor of Architecture degree from Jadavapur University, India, and his Master of Architecture degree from the Massachusetts Institute of Technology. He is a registered architect in New York State.

Martin D. Stein, AIA


With over $10 billion in constructed designs, Marty finds reward in the beauty of solving the intricate puzzles of space, function, image, material, codes, economy, and time that each new project brings.


Marty joined the firm in 1963 when Max O. Urbahn hired him to lead the design of a number of projects at Cape Canaveral for the National Aeronautic and Space Administration, including the Vehicle Assembly and Launch Control buildings. After doing his part to send a man to the moon in the late 1960s, Marty turned his talent to several important healthcare projects, including the Veteran’s Administration Hospital and Lincoln Medical Center, both in the Bronx, NY. Marty embodies the firm’s commitment to architecture for the public benefit. He is responsible for the design of a wide range of large-scale projects, including FermiLab in Batavia, Illinois, and the Federal Home Loan Bank Board Building in Washington, DC.


Marty holds a Bachelors of Architecture degree from Pennsylvania State University and is a registered architect in New York, Connecticut, New Jersey, Maine, Massachusetts, Maryland, and Florida.