New Walmart CISO discusses protecting the world's largest retailer

Securing the world's largest private employer, with more than 2 million people worldwide and an ever-expanding IT environment, is a daunting challenge, but that's exactly what Jerry Geisler is tasked with doing.

Geisler stepped into the global CISO role at Walmart Inc. in January. An employee since college, Geisler had worked his way from the retail floor to the corporate offices. Once there, his personal interest in technology dovetailed with growing responsibilities in forensic investigations and fraud at the Bentonville, Ark., retail giant.

With Walmart's digital transformation and retail expansion into 27 countries outside of the United States, a lot has changed in 20 years. In this interview, the new Walmart CISO talks about retail IT security then and now, top risks the retail giant is concerned about today and the company's new strategy to find tech talent.