BuckleySandler, a firm that specializes in financial services, has brought its wealth of regulatory expertise to a series of big transactions over the past year.

Firm chairman Andrew Sandler said Buckley lawyers often serve as regulatory counsel, assisting big firms with major transactions. "Our flexibility and willingness to work with other firms in that way makes us a very attractive partner," Sandler said. "We have a very specific set of expertise that those firms don't have."