Siegfried Woldhek

Siegfried Woldhek (born May 14, 1951) is a Dutch artist and illustrator. He was the CEO of the Dutch branch of World Wildlife Fund. And he is the founder of the non-profit organization Nabuur. In a 2008 four-minute Ted Talk he explains how he - as an experienced portraitist himself - discovered the true face of Leonardo da Vinci. Provided by Wikipedia