A number of law firms in the greater Washington, D.C., region have achieved this year’s Diversity Lab’s Mansfield Certification program, with firms such as Arnold & Porter and Covington & Burling completing their sixth year of participating, while other firms including Steptoe & Johnson wrap up their first year.

Brownstein Hyatt Farber Schreck, Arnold & Porter, Covington and Wilmer Cutler Pickering Hale and Dorr are among the group of inaugural large law firms that have been participating for all six years of the Mansfield Certification program.