Sison trained in various elements of cake decorating and baking at the Wilton School of Cake Decorating and Confectionery in Woodridge, Illinois; L'Academie de Cuisine in Bethesda, Maryland; Maid of Scandinavia in Minneapolis under Roland Winbeckler, Marsha Winbeckler and Marie Grainger; the Culinary Institute of America at Greystone, Napa Valley and Draeger's Culinary Center in California.
Sison has also appeared either as a judge, commentator, or host in cooking competitions televised nationwide.
Sison is a Director of Petal Craft International, a firm which conducts training in the design of sugar flowers for export and local markets.
Sison is a member of the International Cake Exploration Society and the Bread Bakers Guild of America.
Sison is famous for having baked wedding cakes of actresses Mikee Cojuangco-Jaworski and Ruffa Gutierrez-Bektas.