Who is the unluckiest F1 driver of all time who never won a F1 G.P.?

Chris Amon, the little guy from New Zeeland was once considered the unluckiest F1 driver who never won a F1 G.P.despite his abilities. Currently, Mark Webber has a lot of starts, but no wins. But who do you think possess(ed) the skills, but was never able to win a race (not a title) for a reason or another in the history of F1?