Career[edit]
Sievert started his career at Procter & Gamble,[5] where he oversaw brands such as Pepto-Bismol and Crest.[10] He subsequently worked at IBM[5] and Clearwire.[11] He was also executive vice president (EVP) and chief global marketing and sales officer at E-Trade[12][13] and CEO of tablet gaming company Discovery Bay Games.[14] From 2002 to 2005, Sievert was EVP and CMO of AT&T Wireless.[15] He joined Microsoft's Global Windows Group as corporate vice president of product management in 2005, leading preparations for the release of Longhorn (later called Windows Vista).[16][12] In 2008 he co-founded Switchbox Labs,[15] a startup acquired by Lenovo in 2009.[17] In 2012, John Legere, T-Mobile's then-new CEO, hired Sievert as CMO.[18]
Sievert became COO of T-Mobile in 2015,[19] then became the company's president in 2018.[6][20] During this time, Sievert oversaw the "Un-carrier" marketing campaign, which sought to rebrand T-Mobile's public image[21] with a focus on no overage charges,[10] no contracts, unlimited data, and other offerings.[22] In April 2020, Sievert succeeded Legere as CEO of T-Mobile.[7] Under Sievert's leadership, T-Mobile surpassed 100 million total customers,[23] and created the first nationwide standalone 5G network in the U.S.[24][25] Sievert has declared his strategy of focusing on dominating in 5G, saying “We’re making the rules for the 5G era because we’re way ahead — and I mean miles ahead."[26]
In October 2017, he joined the board of Canadian company Shaw Communications.[27]
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