Career
T-Mobile
Vice Chairman
Position
Vice Chairman
Platform
Resources
Pricing
Vice Chairman / T-Mobile US
Mike Sievert is an accomplished American business executive, best known for his tenure at T-Mobile US, where he served as CEO and President from 2020 to 2025 and is currently the Vice Chairman. He is recognized as a co-architect of the company's "Un-carrier" strategy and has held senior leadership roles at major companies including Microsoft, AT&T Wireless, and E*TRADE Financial. Sievert is also an active investor and entrepreneur in the Seattle area's start-up community.
Vice Chairman
Vice Chairman
Director, Board of Directors
Director, Board of Directors
CEO and President
CEO and President
President and COO
President and COO
Chief Operating Officer
Leads an incredible team of over 40,000 of the best retail, sales, marketing, customer care, and product development people in the technology industry.
Co-architect and leader of the transformational “Un-carrier” strategy. Chief Operating Officer
Executive VP and Chief Marketing Officer
Executive VP and Chief Marketing Officer
Director, Board of Directors
Director, Board of Directors
Investor and Entrepreneur
Co-founder, advisor, investor, occasional interim CEO, and general cheerleader for the vibrant Seattle area start-up community.
Director, Board of Directors
Director, Board of Directors
Chief Commercial Officer and Chairman of Operating Committee
Chief Commercial Officer and Chairman of Operating Committee
Director, Board of Directors
Director, Board of Directors
Director, Vice-Chair
Director, Vice-Chair
Co-Founder, CEO
Co-Founder, CEO
Corporate Vice President, Global Windows Group
Corporate Vice President, Global Windows Group
Executive VP, Chief Marketing Officer
Executive VP, Chief Marketing Officer
Director, Board of Directors Rogers Wireless
Director, Board of Directors Rogers Wireless
Chief Sales and Marketing Officer
Chief Sales and Marketing Officer
Program Director, IBM PC Worldwide Product Management
Program Director, IBM PC Worldwide Product Management
Brand Management
Brand Management
Bachelor of Science (B.S.)
Bachelor of Science (B.S.) - Economics
Core professional competencies derived from decades of executive leadership and strategic roles in major technology and telecommunications companies.
Strategic Planning
Competitive Analysis
Go-to-market Strategy
Business Strategy
P&L Management
Pricing
Mergers & Acquisitions
Executive Leadership
Cross-functional Team Leadership
Management
Leadership Development
Team Building
Board Governance
Marketing
Product Marketing
Marketing Communications
Integrated Marketing
Brand Management
Product Management
Wireless
Telecommunications
Mobile Devices
Start-ups
Entrepreneurship
Business Development
Venture Investing
Telecommunications, Wireless, Mobile Technology, 5G Infrastructure
Consumer Electronics, Financial Services (E*TRADE), Retail (Starbucks), Venture Capital
Visionary, Challenger, Results-Oriented, Transformational, Authentic
Un-carrier Strategy, Customer-Centric, Technology Leadership, Entrepreneurial
A summary of Mike Sievert's professional background, focusing on his executive roles at T-Mobile and key career milestones.
Yes, he is recognized as a co-architect of T-Mobile's "Un-carrier" strategy, which significantly redefined the company's market approach.
He served as the CEO and President of T-Mobile US for five years, from April 2020 until November 2025.
Before his long tenure at T-Mobile, he held senior leadership roles at major companies including Microsoft, AT&T Wireless, and E*TRADE Financial.
Mike Sievert maintains a significant professional presence on LinkedIn, where he has over 157.8K followers.