Date of Birth: 
About William Bon Mardion
- William Bon Mardion (born October 4, 1983) is a French ski mountaineer. Bon Mardion was born and lives in ArĂȘches where he is member of the Club Multisports ArĂȘches-Beaufort.
- He started ski mountaineering in 1998.
- He competed first as a member of the "Espoirs" team at the Pierra Menta race in the same year and has been member of the national team since 2006.
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