Target Corp.’s Chief Information Officer Beth Jacob is resigning, effective immediately, in wake of the massive data breach during the holiday 2013 shopping season which saw as many as 70 million customers having their personal information stolen, including 40 million debit and credit card accounts. The retailer also said would be overhauling its information security practices and compliance division, and would be looking for external candidates to serve as an interim CIO. Jacob had worked at Target in 1984-86, then returned in 2002 as Director of Guest Contact Centers. She was promoted to her current position in 2008, after becoming a VP two years prior. “While we are still in the process of an ongoing investigation, we recognize that the information-security environment is evolving rapidly,” Target Chairman, President and CEO Gregg Steinhafel said in a brief statement released Wednesday morning.