William Reymond is an independent investigating journalist and collection director at the Flammarion publishing house. He has lengthily investigated the assassination of John F. Kennedy and written two books about it : JFK, Autopsie d'un Crime d'Etat, and more recently JFK, le Dernier Témoin, along with Billie Sol Estes.

William Reymond lives in Dallas and works with several French and Swiss information magazines. He also regularly works with Canal+ channel for their "90 minutes" program.