Career
Sievert started his career at Procter & Gamble, [7] where he oversaw brands such as Pepto-Bismol and Crest. [12] He subsequently worked at IBM [7] and Clearwire. [13] He was also executive vice president (EVP) and chief global marketing and sales officer at E-Trade [14] [15] and CEO of tablet gaming company Discovery Bay Games. [16] From 2002 to 2005, Sievert was EVP and CMO of AT&T Wireless. [17] 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). [18] [14] In 2008 he co-founded Switchbox Labs, [17] a startup acquired by Lenovo in 2009. [19] In 2012, John Legere, T-Mobile's then-new CEO, hired Sievert as CMO. [20]
Sievert became COO of T-Mobile in 2015, [21] then became the company's president in 2018. [8] [22] He also joined T-Mobile's board of directors in 2018. [23] During this time, Sievert oversaw the "Un-carrier" marketing campaign, which sought to rebrand T-Mobile's public image [24] with a focus on no overage charges, [12] no contracts, unlimited data, and other offerings. [25] In April 2020, on the day T-Mobile's merger with Sprint closed, Sievert succeeded Legere as CEO. [26] At the time, T-Mobile and Sprint were the third- and fourth-largest wireless carriers in the U.S., respectively. [27] Under Sievert's leadership, T-Mobile surpassed 100 million total customers, [28] and created the first nationwide standalone 5G network in the U.S. [29] [30] 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." [31]
In 2017, Sievert joined the board of Canadian company Shaw Communications. [32]
In June 2020, Sievert decided to pull all T-Mobile advertisements from Tucker Carlson Tonight because of rhetoric that criticized the Black Lives Matter movement. When announcing the move, Sievert tweeted, "Bye-bye, Tucker Carlson!" [33] [34] Sievert also published an open letter about T-Mobile's diversity, equity and inclusion programs. [35]
In 2023, Sievert and Mint Mobile owner Ryan Reynolds announced T-Mobile's plans to acquire both Ultra Mobile and Mint Mobile. [36] That same year, Sievert's total compensation at T-Mobile was $37.5 million, up 29% from the previous year and representing a CEO-to-median worker pay ratio of 521-to-1. [37]
In 2024, Starbucks added Sievert to its board of directors. [4] He also delivered the commencement speech at the Wharton School Master of Business Administration graduation ceremony in May 2024. [38]
From 2024 to 2025, Sievert led T‑Mobile in its $4.4 billion acquisition of U.S. Cellular's wireless operations, including more than four million customers and 2,600 towers. [39] [40] In a July 2025 earnings call, the company reported 132.8 million total customers, [41] up from 86 million in 2019, the year before Sievert became CEO. Annual revenue increased from $45 billion in 2019 [42] to $81.4 billion in 2024. [43] In September 2025, T-Mobile announced Sievert would step down as CEO and become vice chairman. T-Mobile COO Srini Gopalan became CEO on November 1. [44]
Sievert is a member of The Business Council. [45]
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