Representatives of Sony and Epsilon will testify on data breaches at a June 2 hearing of the House subcommittee on Commerce, Manufacturing and Trade, said Ken Johnson, a spokesman for committee chairman Mary Bono Mack (R-Calif.).

Tim Schaaff, president of Sony Network Entertainment International, has confirmed with the committee that he will speak before the panel next week. Both companies declined to testify at a hearing on data breaches the panel earlier this month, after news broke that breaches on Sony’s systems exposed millions of customers’ personal and financial information.

Lawmakers had harsh words for Sony at that hearing, for its decision not to testify and for how it handled the breach.

“While Chairman Bono Mack remains critical of Sony’s initial handling of the data breaches, she also is appreciative that the company has now agreed to testify,” Johnson said in an e-mail. He said Mack is developing comprehensive data protection legislation, which she expects to introduce “in the next few weeks.”

In a letter responding to a second round of questions from Mack and subcommittee ranking member Rep. G.K. Butterfield (D-N.C.), Sony said it had “not yet identified the individual or individuals responsible for the actual intrusion and breach into our systems.” The company is working with the FBI to track down the hackers.

The firm also outlined additional security measures it has taken since the attacks, such as additional firewall protection and more in-depth testing before releasing applications.

Jeanette Fitzgerald, the general counsel for Epsilon, will also speak at the hearing. Epsilon was the victim of a highly publicized breach that released the e-mail addresses of millions of customers from its client companies, including Best Buy, Target, Citi, Capital One and US Bank.