Siegfried Woldhek — Dutch Artist born on May 14, 1951,
Siegfried Woldhek 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... (wikipedia)