He won La Real Academia de Gastronomía's National Gastronomy Award in 2006, and he was a judge on the reality television show MasterChef Colombia.

He trained at the School of Hospitality and Tourism of Madrid, and he spent time working at Zalacaín (three Michelin stars) and Hotel Ritz until 1991, when he joined the staff of the Casino de Madrid and worked for some years with Ferran Adrià.

In 1996, he became head chef of the banquets department there, and in 2000 he ascended to the rank of head of kitchen, still under the direction of NH Hoteles, including among his responsibilities running La Terraza del Casino, which earned its first Michelin star two years later, in 2002.

He has led various workshops on culinary research and additionally has worked as a congressman and teacher in a number of schools.

[citation needed] Since October 2013, Roncero has been a member of the technical division of the Comité de Honor (Honor Committee) for Spain's Selección de Cocina Profesional, a select group of renown Spanish chefs who participate in World Association of Chefs' Societies and Bocuse d'Or competitions.