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The Beginning


Since its founding by Rai Vanderweil in 1950, our firm has remained independently owned, specializing in MEP/FP projects for buildings, power and chiller plants, and transmission lines around the world. Rai’s core philosophy was to create the best solution for each project by approaching it with an open mind; this, along with our goal to provide exceptional client service, continues to guide and inspire us today. Pictured: Manufacturing facility for Smithcraft Lighting.

Peter Stuyvesant - Anthony’s Pier 4, Boston


Our firm’s culture is based upon our shared creative drive, accumulated experience, self-renewal, and a dedication to sustainable solutions and client service. We have coupled retention of our most senior engineers with the infusion of talented, younger staff to ensure the continued development of progressive, customized solutions for our clients, and have established an environment of mutual growth, creativity, and respect. Peter Stuyvesant was a Hudson River Dayliner in the 1920's and 30's, running from New York City to Albany. Many years out of service, in the 60's it was repurposed as a floating cocktail lounge at one of Boston's most popular restaurants.

Engineering Leadership


L to R: Jack Gusman (Chief Engineer), Bob Conviser (Energy Group Dept. Head), Bill Vanderweil (CFO), Cam Bruce (Manager of Solar Energy), Bill Goode (PIC), Gary Vanderweil (President), and Rai Vanderweil in 1978. Jack contributed immensely to our firm’s growth from 1974 until his retirement in 1999. Many of you have convened in our Boston office’s Gusman conference room, named in Jack’s honor.



Nelson Pavao and Darryl Galletti, pictured collaborating on a central plant design. Combined, they enjoyed an impressive 84 years working at Vanderweil. Both recently retired; Daryl after 47 years and Nelson after 37 years.

Hoffman-La Roche, New Jersey


Our Power Group has designed chilled water plants up to 300,000 tons, steam boiler plants up to 900,000 pph, and Power/CHP plants up to 550 MW. Pictured here is the 1992 installation of chilled water pumps in a 20,000 ton central plant for Hoffman-La Roche, in Nutley, NJ. A repowering of the existing cogeneration plant with a new 12 MW CHP unit soon followed.

Marina Bay Sands, Singapore


Engineering design of the iconic 9.5 million sf Marina Bay Sands complex in Singapore. The buildings comprise three 57-story hotel towers with 3,000 guest rooms. They are connected at the top by a three-acre rooftop sky garden with swimming pools, restaurants, and a spa.

International Spy Museum, Washington, D.C.


We have been fortunate to work on many exciting and challenging projects throughout the decades and we look forward to seeing what’s next. We are confident and hopeful that Vanderweil will remain an independent company, holding itself to the same high standards and core values upon which we were founded. The International Spy Museum was the winner of the 2019 Architectural Engineering Institute’s Most Innovative Project Greater than $100 Million.

The Future


We stay ahead of the curve through continuous learning, adaptation, and change. This encompasses a continual and purposeful progression of younger engineers advancing in the firm and working with our senior staff leadership, who are experts in their respective fields.