History Timeline

  • June
    It Begins... 1, 1973

    June 1, 1973 - The Firm is Founded

    Richard S. Di Salvo, PE starts the firm as a one-person endeavor in Ridgefield, Connecticut.  Dick founded the firm to offer a higher level of structural engineering service than prevailed at that time.

  • 1973

    1973 - 

    409 Main Street, Ridgefield.  The first office location.

  • 1974

    1974 - 

    Mauro Cetra, PE joins Dick to form Di Salvo + Cetra.  Over the next ten years, Di Salvo + Cetra developed into one of the leading structural firms in the state.

  • 1980's

    1980's - 

    Employees at the 88 Danbury Road, Ridgefield location.

  • 1984

    1984 - 

    Dick becomes President of the newly named corporation, Di Salvo Associates, and makes John MacDonald, PE and Art Sanders, AIA partners of the firm.

  • Mid

    Mid-1980's - 

    The leadership group of Clay Hines, Ken Jones and Bruce Richardson, who contributed greatly to the firm’s growth over the next two decades, join the firm.

  • 1987

    1987 - 

    Clay Hines heads up a new office in Fishkill, New York.

  • 1989

    1989 - 

    The firm is renamed Di Salvo MacDonald Ericson.

  • 1994

    1994 - 

    The Company is the recipient of CT Engineers in Private Practice coveted 1995 Outstanding Engineering Award for The National Hall in Westport, CT.

  • 1995

    1995 - 

    Ken, Clay and Bruce are promoted to Principal and become new Shareholders.  The firm is renamed The Di Salvo Ericson Group, Structural Engineers, Inc. (TDEG) to recognize the major contributions of all the principals and associates.

  • 1998

    1998 - 

    Celebration of 25 year anniversary in June but then Dick dies suddenly in July.

  • 2001

    2001 - 

    TDEG becomes a Professional Corporation (PC) in the State of New York due to a growing clientele that Clay Hines has developed in that state.

  • 2004

    2004 - 

    Bruce was made President and took on the responsibility for general management and continued to oversee operations & project management.   Clay and Ken became Vice Presidents with Clay directing marketing activities & quality management.  Ken continued as financial director & assumed responsibility for HR.  Val stepped down as President while remaining Chairman of the Board.

  • 2009

    2009 - 

    TDEG is awarded “Best Firms to Work For” by Structural Engineer magazine and research firm ZweigWhite.  This is an annual award where industries are able to view how they stack up against their peers.   TDEG won “Top Fifteen”.

  • 2014

    2014 - 

    The firm was renamed to The Di Salvo Engineering Group, Structural Engineers.  Sadly, Clay Hines passed away suddenly the same year.

  • 2015

    2015 - 

    Trevor Hill is made a Principal of the firm.

  • 2015

    2015 - 

    Later in 2015, the firm moved out of Ridgefield after occupying five different offices over 42 years and resettled in Lee Farm Corporate Park in Danbury.

  • 2018

    2018 - 

    TDEG celebrates 45-Year Anniversary 1973 – 2018  

  • 2018

    2018 - 

    TDEG opens Castle Rock, Colorado office.

  • 2022

    2022 - 

    Ken Jones retires after nearly 39 years with TDEG.

  • 2023

    2023 - 

    To mark the 50th year providing structural engineering services, TDEG launches a new logo.   Also, TDEG moves to a new office space at 93 Lake Avenue, Danbury.  Sadly, Trevor Hill passed away in September.

  • 2024

    2024 - 

    Ryan Walsh, PE and Stephen Lehigh, PE were both promoted to the role of Associate Principal..


Recent Projects

Savings Bank of Danbury
The Mill
Winter Park Building
Whaling City Mazda
Westport Home with Guest House
Boys & Girls Club of Greenwich
St. Denis
Lake House
Pound Ridge Fire Station


We pride ourselves on technical excellence, innovation and following the highest professional standards.
Contact us today to partner on your next project.