Mark David Williamson

b. 1957

Last updated September 28, 2026

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Time on boards

Boards served
2
Board service
22 years
Director since
2007

22 years of board service in total across 2 boards, counting each seat separately. Longest: Imperial Brands PLC, 12 years.

Imperial Brands PLC Director
12 years · 2007 – 2019
National Grid PLC Director
9 years · 2012 – 2021

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