In April 1996, Colin A. Coleman formed Coleman & Associates after nine years in the corporate department of the Boston office of Edwards & Angell, LLP (now known as Edwards, Angell, Palmer & Dodge, LLP).  Coleman & Associates expanded shortly thereafter with the addition of several associate attorneys, including Lawrence J. Sheh in 1998.

In February 2004, Timothy A. Gagnon joined Mr. Coleman as a partner, adding his years of experience as a Certified Public Accountant and tax attorney.  The firm changed its name to Coleman & Gagnon, P.C. 

In September 2006, the firm expanded again with the hiring of two associate attorneys, including Marie A. Bober.  At the same time, Lawrence J. Sheh was promoted to Senior Associate Attorney. 

In December 2007, Timothy A. Gagnon changed his status at the firm from partner to counsel so that he could accept a full-time professorship at the Northeastern University Graduate School of Business Administration.

In January 2008, the firm narrowed its focus to concentrate primarily on the needs of clients in the firm’s expanding business and corporate practice.