During the two following years, he interviewed Julio Iglesias, Miguel Bosé, Armando Manzanero, and Rocío Dúrcal and others.
Although Laguardia made his acting debut in Dune (1984) directed by David Lynch, it was three years before he got his first starring role in a telenovela; since then he has appeared in 17 telenovelas so far, including Quinceañera starring Adela Noriega and Thalía; Mi Querida Isabel; Alondra; Lazos de Amor; Desencuentro; Laberinto de Pasiones; La Antorcha Encendida; Amigas y Rivales; Amor Real and Amigos X Siempre.
While he lived in New York City he studied acting in Carnegie Hall with Wynn Handman.
In 2008 Ernesto returned to Hoy and had a small role in the telenovela Fuego en la sangre.
In 2012, Laguardia played Romulo Ancira, the main villain of the soap opera Corona de lágrimas (2012 telenovela).