Yahoo Inc. has hired a high-profile team from Gibson, Dunn & Crutcher as co-counsel to help handle the multidistrict litigation over the company's massive data breach.

Gibson Dunn partners Theodore J. Boutrous Jr., Joshua A. Jessen, Michael Li-Ming Wong and Rachel S. Brass all entered appearances for Yahoo Tuesday. Hunton & Williams partner Ann Marie Mortimer, who has taken the lead for Yahoo's defense thus far, confirmed by email Wednesday morning that the Gibson Dunn team will join her team as co-counsel.

Boutrous, the global co-chair of Gibson's litigation group, has handled a number of highly publicized matters for technology companies, including class actions targeting Uber for misclassifying its drivers as independent contractors rather than employees, and Apple's high stakes showdown with the FBI over an encrypted iPhone used by the shooter in the 2015 San Bernardino, California, terrorist attack. Wong also notably helped Uber beat back a long-running data breach class action stemming from a 2014 breach where about 50,000 drivers had their names and drivers' license numbers compromised.

Gibson Dunn's addition comes as Judge Lucy Koh of the U.S. District Court for the Northern District of California, who is overseeing the case, has indicated she wants to keep a close eye on the number of attorneys plaintiffs have on the case. Koh issued “efficiency protocols” in early February aimed at the plaintiffs asking that no law firms work on the MDL without her prior approval other than the five-firm coalition she picked last year to form the steering committee.

Koh's move in the Yahoo case came in the wake of a $38 million fee request in a separate data breach MDL she has overseen involving health insurance company Anthem. In the Anthem case, 49 plaintiffs firms besides co-lead counsel at Altshuler Berzon and Cohen Milstein Sellers & Toll submitted bills as a part of plaintiffs' fee request. Koh has appointed a special master to review the bills in the Anthem case.