After rising to fame for winning the 2006 Great British Menu reality cooking contest, Williams became executive chef at Odette's Restaurant in London, England.
Upon completing his catering training at north Wales' Coleg Llandrillo Cymru, he apprenticed at the Criterion restaurant and went on to become sous chef at Le Gavroche in Mayfair, London.
For several years, he worked under Andre Garrett at London's Michelin rated Orrery Restaurant.
One of three siblings, he grew up in a Welsh speaking family in Denbighshire, Wales.
At the start of his culinary career, Williams trained with celebrity chef Marco Pierre White.