Chef Tal Ronnen is the most celebrated vegan chef working today. In the spring of 2008, he became known nationwide as the chef who prepared vegan meals for Oprah Winfreyamp;#039;s 21-day vegan cleanse. He has since catapulted to fame, catering Ellen DeGeneres and Portia de Rossiamp;#039;s vegan wedding, Arianna Huffingtonamp;#039;s party at the Democratic National Convention, and the first vegan dinner at the U.S. Senate.