B. Kevin Turner (born April 3, 1965) is an American businessman and investor who is currently the chairman of Zayo Group and the vice chairman of Albertsons/Safeway Inc. Turner was most recently president and CEO of Core Scientific, a technology company specializing in blockchain and artificial intelligence from 2018 to 2021. He previously served as the COO of Microsoft from 2005 to 2016. Prior to joining Microsoft, Turner was the CEO of Sam's Club and the CIO of Walmart. He is also the former vice chairman of Citadel LLC and CEO of Citadel Securities.