10 T-Mobile operations leaders
T-Mobile's chief operating officer title connects the first two people here, Jon Freier in the role now and Mike Sievert from 2015 to 2020, and the other eight have held vice president or senior vice president operations titles across network, engineering, consumer, customer care, broadband, IT and pricing. Three also list Sprint roles, useful if you are planning a carrier integration, and the network and engineering titles suit anyone sizing infrastructure deployment.
Professionals to explore
Chip Stovall
LinkedInExperience: VP IT Business Operations and Transformation · T-Mobile
VP IT Business Operations and Transformation at T-Mobile since 2022, Chip Stovall works on IT transformation programs and efficiencies, and was Sr Director, Integration and Synergy at T-Mobile (2020–2022). Sprint titles were Director, COO Chief of Staff (2018–2021), Director, Sales Distribution and Omni-Channel Operations (2011–2018) and Director, Business Finance (2008–2011), which suits questions on integration and synergy work and IT operations.
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Christie Sandoval
LinkedInExperience: Former Senior Vice President, Consumer Experience and Customer Care Operations · T-Mobile
Christie Sandoval was Senior Vice President, Consumer Experience and Customer Care Operations at T-Mobile (2022–2026) and has been Executive Vice President and Chief Customer Officer since December 2025, describing a team of 15,000+ frontline professionals across Customer Service, Global Care Operations and HQ functions. Other T-Mobile titles include Senior Vice President, Consumer Operations (2020–2022) and Vice President, Retail Sales Operations & Experience (2017–2020).
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Jennifer Silveira
LinkedInExperience: Senior Vice President- Engineering and Operations · T-Mobile
In Frisco, Texas, Jennifer Silveira has held the Senior Vice President- Engineering and Operations title at T-Mobile since 2011. T-Mobile titles also include National Director of Engineering- PMO (2008–2011), Regional Director of Engineering- PMO (2006–2008) and Director of Engineering and Operations (2004–2006), a record suited to questions on engineering program management and network operations inside one carrier.
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John Stevens
LinkedInExperience: Senior Vice President Consumer Operations and Planning · T-Mobile
John Stevens became Senior Vice President Consumer Operations and Planning at T-Mobile in June 2024, a role covering go-to-market strategy, integrated operations, business continuity and incentive design. Other roles include Vice President Small Markets and Rural Areas at T-Mobile (2020–2024), Region President (2008–2020) and Vice President Branded Retail (2007–2008) at Sprint, and Senior Vice President Operations at Hollywood Entertainment (1993–2007).
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Jon Freier
LinkedInExperience: Chief Operating Officer · T-Mobile
Jon Freier has been Chief Operating Officer at T-Mobile since December 2025, a role described as leading enterprise-wide transformational programs and the day-to-day business functions that serve tens of millions of customers in the United States. Earlier T-Mobile titles include President, U.S. Consumer Group (2021–2025), Executive Vice President, U.S. Consumer Markets (2019–2021), Executive Vice President, U.S. Retail & Operations (2015–2019) and Vice President, Sales & Distribution (2010–2015).
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Kristin Bragg
LinkedInExperience: VP - Head of Pricing, Planning & Operations · T-Mobile
Kristin Bragg, based in the New York City area, has been VP - Head of Pricing, Planning & Operations at T-Mobile since April 2024. At Warner Bros. Discovery Advertising the titles were EVP Pricing, Planning & Operations (2021–2022), SVP, Pricing, Planning & Operations (2020–2021) and SVP Ad Sales Strategic Planning (2012–2020), plus VP Ad Sales Strategic Planning at Turner (Turner Broadcasting System, Inc) (2006–2012), a fit for pricing and planning questions.
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Lori Ames
LinkedInExperience: Senior Vice President - Network Infrastructure & Operations · T-Mobile
Responsibility for the design, engineering, deployment and operations of the network infrastructure foundation behind T-Mobile's nationwide network sits with Lori Ames, Senior Vice President - Network Infrastructure & Operations since September 2025. Other T-Mobile titles are Senior Vice President - Cloud, IP & Transport Development (2024–2025), Vice President - Cloud, IP & Transport Development (2023–2024) and Vice President Network Development (2020–2023), plus Vice President - Network Central Region at Sprint (2018–2020).
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Martha Ventura
LinkedInExperience: VP of Engineering & Operations - State of California · T-Mobile
Martha Ventura has two T-Mobile titles, VP of Engineering & Operations - State of California since 2018 and VP of Engineering & Operations - Southern California since 2008, and describes the VP role as Emerita. Earlier roles include Executive Director Engr & Ops - Southern California at AT&T (1995–2007), Engineer at Pacific Bell Mobile Services (1995–2000) and Sr. Engineer at Bellua Asia Pacific (1988–1995), with 35 years in network engineering and operations described.
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Mike Sievert
LinkedInExperience: Former President and COO · T-Mobile
Mike Sievert held two T-Mobile operating titles, Chief Operating Officer (2015–2020) and President and COO (2018–2020), and was CEO and President from 2020 to 2025. Current T-Mobile roles are Vice Chairman, since November 2025, and Director, Board of Directors, since 2018, so Mike Sievert can speak to the COO seat and to how operating priorities look from the CEO and board level.
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Stephanie Miller
LinkedInExperience: Vice President, Broadband Operations · T-Mobile
Stephanie Miller has been Vice President, Broadband Operations at T-Mobile since December 2025 and was Sr Director, Fiber Operations (2024–2025). Other T-Mobile roles include Sr Director, Marketing Operations (2022–2024), Sr Director, GTM and Operations (2022) and Director, Business GTM & Operations (2021–2022), making Stephanie Miller a fit for questions on fiber and broadband operations.
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Choose the right perspective
Network and engineering questions belong with Lori Ames, Jennifer Silveira or Martha Ventura, the three engineering and network titles here. Customer care and frontline service questions suit Christie Sandoval, while John Stevens, Stephanie Miller, Chip Stovall and Kristin Bragg cover consumer planning, broadband, IT transformation and pricing; for company-wide operating trade-offs, start with Jon Freier or Mike Sievert.
Questions to take into the conversation
- 01When a wireless carrier adds a broadband or fiber business, which operations teams should it share with mobile and which should stand alone?
- 02How do you plan network infrastructure deployment so that field engineering and operations teams are not working from different priorities?
- 03What changes in customer care operations once AI tools are handling part of the contact volume?
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.