People

At ENV, we’ve built a talented team with a reputation for designing solutions that work in the real world.

We know that the best projects are collaborative, and we make a point to listen, ask tough questions, and share insights along the way. Clients trust our principal-led teams to deliver projects on time, on budget, and as promised.

Charles Koch, AIA, PPCID, NCARB
Vice President | Englewood Cliffs, NJ

Charlie graduated New Jersey Institute of Technology in 1986 where he earned a bachelor in Architecture and design. Over the course of his career Charlie has worked his way up to a principal. In 2009 he became a Principal at ENV in New Jersey where he specializes in the design of educational facilities at the primary, secondary and university levels. Prior to starting ENV, Charlie was a principal at a large international AE firm where he headed the K12 studio and Vice President of Seyffer and Koch Architectural Group. He has served as a visiting critic at NJIT and is a former Board Member for the Westwood Regional School District where he served as Vice President and chaired the Building and Grounds Committee for almost 20 years. As a licensed architect, professional planner and interior designer, Charlie has over 30 years of experience in the rehabilitation of existing facilities and new structures. He has worked closely with schools, universities and corporate clients completing projects ranging from simple infrastructure repairs to Master Plans. Including an 1100 bed Residential Life Complex for William Paterson University, a new school of business at Montclair State University and a new school of nursing at The College of Mount Saint Vincent in New York. As board architect he has developed both yearly and long range facilities plans for school districts in the tri state area. Charlie has extensive experience in working with various state agencies throughout the New York metropolitan area and has presented to the New Jersey School Boards Association on legal and technology initiatives.

In his free time Charlie is an avid fan of long distance running and cycling. On the weekends he spends his time working on the family beach house and co-running a public garden railway (LBI Railway) with his son.

Hans P. Erdenberger, AIA, NCARB
President | Englewood Cliffs, NJ

Hans has been a licensed architect since 1987. He holds a Bachelor of Architecture degree from New Jersey School of Architecture at New Jersey Institute of Technology where he is currently a member of the Deans Executive Council and has served on several mentorship committees as well as being a visiting design critic. Hans is also a certified member of the National Council of Architectural Review Board.

Hans started his career in the construction industry before joining a medium sized architectural group in North Jersey where he quickly rose to the position of Vice President. He later joined a large international AE firm as Principal before starting his own firm in the fall of 2009. Throughout his professional career Hans has compiled an impressive portfolio of work in the academic, commercial, hospitality, retail and residential practice areas. His projects range from renovation projects of all sizes to major new developments.

Joseph Siegel
Principal | Englewood Cliffs, NJ

Joseph Siegel has more than forty years of experience in architecture and interior design projects involving over 20 million square feet of commercial space and buildings in excess of $750,000,000 in construction costs. During this time he has specialized in projects including; the design of new facilities, interior design and fit-out, rehabilitation and conversion of existing buildings, panning and feasibility studies, programming, operational analysis and project management. Mr. Siegel has a proven track record with clients and builders in bringing projects from conceptualization through construction drawings to final tenant occupancy. Among his many skills is his proven history of establishing complete budgets, bringing the projects in within the projected cost estimates and completing them on or before the scheduled completion date, accommodating the individual client’s requirements. Although, best known for his work on large projects with some of the most prestigious corporate clients in the country. Mr. Siegel’s experience also includes work on projects of limited scope, which are handled with the same dedication to detail and professionalism. This approach has brought many clients back with new projects over the years. As the driving force behind Design Collaborative Architecture and Planning, Joseph Siegel has honed a team of talented architects and design professionals who adapt seamlessly to provide quality architectural and design services for a range of client requirements. He has a hands-on approach, interacting continuously with the project managers throughout each phase of a project. Mr. Siegel attended New York Institute of Design and Construction and Pratt Institute in Brooklyn, New York.

Kurt Otto
Principal | Englewood Cliffs, NJ

Kurt has over 20 years of experience in Architectural Design & Construction. He received his Bachelors of Architecture Degree from Pratt Institute, Brooklyn, New York. Kurt’s role at ENV, is heading up the Residential Design and Business Development divisions.

After graduating Pratt, Kurt joined a premier New Jersey Architecture firm where he became the lead designer in Residential Architecture, Project Management and Business Development.
Over the years, Kurt has created a substantial portfolio of beautiful homes and buildings which continues to build his insatiable passion, for his timeless designs.

Kurt enjoys spending quality time with his wife and twin children, training Renzo Gracie Brazilian jiu-jitsu, and playing golf.