Shadows of the trees on building wall in the Charlestown Navy Yard

Our Clients

A true partnership is a two-way street — ideas and information flow openly and regularly, based on a foundation of mutual trust and respect for one another’s expertise — and our clients embrace this philosophy.

The best and most productive relationships are synergistic and goal-oriented, and a long-term relationship has the value add of deep-rooted industry and company knowledge and relationships.

Our client list speaks for itself. Since our earliest days, we’ve represented everything from start-ups to Fortune 500 companies with that same partnership approach and dedication at the core of every engagement. Every day, since 1996, we’ve been devoting our hearts and minds to our clients, achieving great successes and building lasting relationships. Meet The Castle Group team or go to our Castle News to learn more.

Here is a sample of our current and past clients

American Tower logo
American Tower logo
Boston Bruins Logo
Boston Bruins Logo
Boys & Girls Clubs of Boston Logo
Boys & Girls Clubs of Boston Logo
Massachusetts Biotechnology Council
Massachusetts Biotechnology Council "MassBio" logo
Mount Holyoke logo
Mount Holyoke logo
Pegasystems Logo
Pegasystems Logo
Project-STEP Celebrating 40 years logo
Project-STEP Celebrating 40 years logo
Skanska Logo, Castle Client
Skanska Logo, Castle Client
Tripleseat Logo
Tripleseat Logo