Thomas Dannenfeldt — Board Member Accountability Profile
Category: Private Citizen — Corporate Director Role: Director, T-Mobile US Inc. (TMUS); new nominee 2025 Board Tenure: 2025 – present (new nominee) Committee Memberships: None assigned as of proxy Profile Type: Board Member Accountability — Anchor B (Documented Organizational Leadership)
Basis for Inclusion: Thomas Dannenfeldt holds a documented governance role as a newly elected Deutsche Telekom–designated director at T-Mobile US, nominated in 2025. This profile documents the factual governance relationship, not the subject’s personal political views.
Subject Classification: Private Citizen / Corporate Director. Board membership is a matter of public record (SEC filings, proxy statements). This profile documents only the governance role and its connection to documented corporate governance and political activity.
Biographical Overview
Thomas Dannenfeldt served as CFO of Deutsche Telekom AG from 2014 to 2018, having substantial institutional knowledge of T-Mobile US’s financial history and the Sprint merger financing. He is currently Chairman of the Supervisory Board of Ceconomy AG (MediaMarktSaturn) and a director of Nokia Corporation. Prior to Deutsche Telekom, he held senior finance roles at other European telecommunications companies.
Dannenfeldt was nominated to the T-Mobile board in 2025, replacing a departing Deutsche Telekom–affiliated director as DT manages its board representation following the Sprint integration completion.
Board Role and Governance Authority
- Company: T-Mobile US Inc. (NASDAQ: TMUS)
- Board tenure: 2025 – present (new nominee, committees TBD post-election)
Other Current Board Memberships
- Ceconomy AG — Supervisory Board Chairman
- Nokia Corporation (NASDAQ: NOK)
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Investigative trail pointers (public records)
Education only — verify independently. Absence of hits is not proof.
| Channel | Starting points |
|---|---|
| Federal courts | CourtListener / PACER party and attorney searches (spelling variants) |
| Campaign finance | FEC + OpenSecrets for committees and donors tied to documented roles |
| Corporate / LLC | State secretary of state; OpenCorporates for cross-border shells from reporting |
| Sanctions / PEP | OpenSanctions when international business context is already sourced |
| Contracts / grants | USAspending.gov for named entities from investigations |
Use public-records-research-specialist, corporate-intelligence-investigator, and public-corruption-ombudsman evidence tiers.
Sources
- T-Mobile US Inc. DEF 14A Proxy Statement, filed April 18, 2025; SEC EDGAR (CIK 1283699)