B. Kevin Turner

During his nearly 20 years at Walmart, Turner rose through the ranks from a store cashier to become the company's global CIO, then CEO of Sam's Club, a $37 billion division of Walmart. Turner was the chief operating officer of Microsoft from 2005 to 2016. From 2016 to 2017, he was the vice chairman of Citadel LLC and CEO of Citadel Securities.

As Microsoft COO, Turner led the company's global sales, marketing, and services organization. He also managed Microsoft's partner channels and corporate support functions, including information technology, licensing, pricing, and operations. His organization included more than 70,000 employees in more than 190 countries. Turner remained through the transitions of Bill Gates, Steve Ballmer, and Satya Nadella.