Sebastian Gielen – Biography
Last update: March 4, 2026Executive profile
Sebastian Gielen is currently
Senior Vice President, Operating and Transformation Office at T-Systems - View - T-Systems org chart
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Company Colleagues
- At T-Systems, Sebastian Gielen has 240 colleagues including Ferri Abolhassan (CEO), Guillaume Maisondieu (Director)…
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- In the Information Technology & Services industry, Sebastian Gielen has 28,667 colleagues in 1,478 companies located in 69 countries. 12,644 executive movements have been recorded in the last 12 months. Learn more about Information Technology & Services.
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