Launched last summer as a corrective to an industry dominated by white men, the Mansfield Rule sought to tackle the gender and diversity gap in Big Law leadership in part by using a powerful promise: bragging rights.

Now, 41 of the nearly 50 firms that implemented the rule in its inaugural pilot year have earned those rights, receiving the coveted designation, “Mansfield Certified.” Among them are four Pennsylvania-based firms: Blank Rome; Buchanan Ingersoll & Rooney; Morgan, Lewis & Bockius; and Reed Smith.