As the company's top technology executive, Jacob had responsibility for Target's computer systems and network, which succumbed to hackers late last year, enabling a massive data breach.
The breach began on Nov. 27, was confirmed on Dec. 15, and ended on Dec. 18. The company initially said 40 million credit and debit card accounts were affected, but its investigation subsequently revealed that a separate set of data, stored elsewhere and covering 70 million accounts, also had been stolen.
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