SAN FRANCISCO (September 14, 2021) – Diversity Lab announced today that 118 leading law firms have achieved Mansfield Rule 4.0 Certification. The certified firms have completed a rigorous 12-month collaboration with Diversity Lab with built-in measurement, transparency and accountability. Through their participation, they have demonstrated an unwavering commitment to diversity, equity and inclusion and are making meaningful progress on diversifying law firm leadership.

The goal of the Mansfield Rule is to boost the representation of historically underrepresented lawyers in law firm leadership by broadening the pool of candidates considered for these opportunities. The Mansfield Rule Certification measures whether law firms have affirmatively considered at least 30 percent women, underrepresented racial/ethnic groups, LGBTQ+ lawyers and lawyers with disabilities for leadership and governance roles, equity partner promotions, formal client pitch opportunities, and senior lateral positions. Mansfield Certification Plus status indicates that, in addition to meeting or exceeding the baseline certification requirements, the firms have successfully reached at least 30 percent underrepresented lawyer representation in a notable number of their current leadership roles.

“We are thrilled to celebrate these firms that have worked so tirelessly to implement the Mansfield Rule principles and create inclusive workplaces where every lawyer has the ability to thrive and the opportunity to lead,” said Natalia Marulanda, Mansfield Rule Director at Diversity Lab. “Despite the ongoing challenges of the pandemic, the Mansfield Rule certified firms have not deviated from their goal of ensuring that law firm leadership reflects the rich diversity of the profession. We are enormously proud to work with such a committed group of firms.”

Diversity Lab also announced today that more than 70 law firms will participate in the second iteration of the Midsize Mansfield Rule, which will launch on September 15, 2021. These 70+ firms will join the original 25+ law firms that began piloting the Midsize Mansfield Rule in 2020. The Midsize Mansfield certification process, modeled after the version for larger firms, has been fine-tuned to boost diversity in leadership for firms with smaller lawyer populations, single office locations, and leaner firm leadership structures. The certification period for the Midsize version is 18 months (September 15, 2021 to March 14, 2023) to provide sufficient time for the participating firms to take action on hiring, promotion, and leadership transition activities.

Similar to the larger law firm version, firms that successfully complete the Midsize Mansfield Rule criteria will be designated as “Mansfield Certified” and will have the opportunity to send their historically underrepresented partners to the Mansfield Rule Client Forums in 2023 to build relationships with and learn from Diversity Lab’s in-house counsel collaborators. To date, more than 80 legal departments have contributed to or hosted Client Forums, including Google, ExxonMobil, Verizon, CBS, MassMutual, Pfizer, Facebook, Gap, Salesforce, Twitter, Uber, Starbucks, American Express, Ford Motor Co., and Target.

“Farella Braun + Martel has a deep commitment to ensuring inclusive, equitable work environments and to growing greater diversity in the legal pipeline. Through embracing challenging, innovative initiatives—like the Midsize Mansfield Rule—as part of a community of firms with these common goals, we believe we can help drive positive change that benefits the entire legal ecosystem,” said Farella Managing Partner Brian P. Donnelly.

Mansfield Rule 4.0 Certified Firms
*indicates Plus Status


Akin Gump Strauss Hauer & Feld* Allen & Overy*

Archer & Greiner

Arent Fox

Arnold & Porter Kaye Scholer* Baker Botts*

Baker, Donelson, Bearman, Caldwell & Berkowitz*

Baker McKenzie*

Ballard Spahr*

Beveridge & Diamond*

Blank Rome*

Boies Schiller Flexner

Bricker & Eckler*

Brown Rudnick

Brownstein Hyatt Farber Schreck *

Bryan Cave Leighton Paisner*

Buchanan Ingersoll & Rooney*


Chapman and Cutler*

Clifford Chance

Clyde & Co.


Covington & Burling*

Cozen O’Connor*

Crowell & Moring

Davis Wright Tremaine*

Day Pitney*



Dentons Canada*

Dinsmore & Shohl*

DLA Piper*

Dorsey & Whitney*

Duane Morris*

Eversheds Sutherland*

Faegre Drinker*


Fenwick & West*

Finnegan, Henderson, Farabow, Garrett & Dunner*

Fish & Richardson*

Fisher & Phillips*

Foley Hoag

Fredrikson & Byron*

Freshfields Bruckhaus Deringer*

Frost Brown Todd*


Goulston & Storrs*

Greenberg Traurig*

Hanson Bridgett*

Haynes and Boone*

Hogan Lovells*

Holland & Hart*

Holland & Knight*

Hunton Andrews*

Husch Blackwell*

Ice Miller

Jackson Lewis*

Jenner & Block*

K&L Gates

Katten Muchin Rosenman*

Kaufman Dolowich & Voluck Kean Miller*

Lane Powell*

Latham & Watkins*

Littler Mendelson*

Locke Lord*

Lowenstein Sandler

MG+M The Law Firm*

Mayer Brown

McDermott Will & Emery*


Miller Canfield*

Miller Nash Graham & Dunn* Morgan Lewis*

Morris, Manning & Martin

Morrison & Foerster*

Munger, Tolles & Olson*

Neal Gerber Eisenberg

Nixon Peabody*

Norton Rose Fulbright*


O’Melveny & Myers*


Patterson Belknap Webb & Tyler* Paul Hastings*

Perkins Coie*

Pillsbury Winthrop Shaw Pittman* Polsinelli*

Porter Wright Morris & Arthur* Procopio, Cory, Hargreaves & Savitch*

Reed Smith*

Robins Kaplan*

Robinson & Cole

Saul Ewing Arnstein & Lehr*

Schiff Hardin*

Seyfarth Shaw*

Shearman & Sterling*

Sheppard Mullin Richter & Hampton*

Shipman & Goodwin*

Skadden, Arps, Slate, Meagher & Flom*


Stoel Rives*

Stoll Keenon Ogden

Stradley Ronon Stevens & Young Taft Law*

Thompson Coburn*

Thompson Hine

Troutman Pepper*

Tucker Ellis*

Vinson & Elkins

Vorys, Sater, Seymour and Pease

White & Case*

Williams & Connolly WilmerHale*

Wilson Sonsini Goodrich & Rosati*

Winston & Strawn*

Womble, Bond, Dickinson


Midsize Mansfield Rule — Participating Firms 2021-2023

Baird Holm LLP

Barton Gilman LLP

Bressler, Amery & Ross, P.C.

Buckley LLP

Burns White

Cantor Colburn LLP

CDF Labor Law

Coblentz Patch Duffy & Bass LLP

Collins + Collins

Collins Einhorn Farrell PC

Cox, Castle & Nicholson LLP

Davis and Gilbert LLP

Degan, Blanchard & Nash

Dority & Manning, P.A.

Farella Braun + Martel LLP

Finn, Dixon & Herling LLP

Fitch Even Tabin & Flannery LLP

Foley & Mansfield, PLLP

Foster Swift Collins & Smith PC

Genova Burns LLC

Greensfelder, Hemker & Gale, P.C.

Hahn Loeser & Parks

Hall Render Killian Heath and Lyman PC

Hancock Daniel & Johnson, P.C.

Harness, Dickey & Pierce, P.L.C.

Harris, Wiltshire & Grannis LLP

Hartline Barger LLP

Higgs Fletcher & Mack

Hinckley Allen

Hoagland, Longo, Moran, Dunst & Doukas, LLP

Hurwitz & Fine, P.C.

Irwin Fritchie Urquhart and Moore LLC

Jackson Kelly PLLC

Klarquist Sparkman, LLP

Lerner David Littenberg Krumholz & Mentlik LLP

Lewis Thomason

Lightfoot, Franklin & White LLC

Marks O’Neill O’Brien Doherty & Kelly

Maslon LLP

McAnany, Van Cleave & Phillips

McDonnell Boehnen Hulbert & Berghoff LLP

McGinnis Lochridge LLP

McGivney, Kluger, Clark & Intoccia, P.C.

McGlinchey Stafford

Meagher & Geer

Messner Reeves

Miller & Chevalier Chartered

Montgomery McCracken Walker & Rhoads, LLP

Nicolaides Fink Thorpe Michaelides

Sullivan LLP

O’Hagan Meyer

Parker, Hudson, Rainer & Dobbs LLP

Phillips Murrah PC

Phillips Nizer LLP

Plunkett Cooney

Prince Lobel

Reichman Jorgensen Lehman & Feldberg LLP

Roig Lawyers

Sands Anderson PC

Saxe Doernberger & Vita

Schwabe, Williamson & Wyatt PC

Schwegman, Lundberg & Woessner

Shuttleworth & Ingersoll, PLC

Skarzynski Marick & Black LLP

Smith Anderson

Stark & Stark

Sterne, Kessler, Goldstein & Fox

Swift, Currie, McGhee & Hiers

Tiber Hudson LLC

Waldon Adelman Castilla Hiestand & Prout, LLP


Winget, Spadafora & Schwartzberg, LLP

Wolf Greenfield & Sacks

Wyrick Robbins Yates & Ponton LLP



About Diversity Lab
Diversity Lab is an incubator for innovative ideas and solutions that boost diversity and inclusion in law. Experimental ideas are created through Hackathons and piloted in collaboration with more than 150 top law firms and legal departments across the country. Diversity Lab leverages data, behavioral science, design thinking, and technology to further develop and test new ideas and research, measure the results, and share the lessons learned. 


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