Capital One has turned to King & Spalding’s David Balser to represent the financial institution in nearly 40 class actions brought over a data breach announced last month.

Balser, a partner in Atlanta, is a prominent expert in cybersecurity: He represented Equifax Inc. in 250 lawsuits and government regulatory actions brought over a 2017 breach that settled last month for $1.4 billion. The suits against Capital One, brought in federal courts in nine states and the District of Columbia, allege the financial institution failed to secure its customer data. The breach compromised the personal information, including Social Security numbers, of 100 million customers in the United States and 6 million in Canada.