At age 12, Gian Marco sang for the first time on television in the Argentine TV show Domingos Gigantes (Giant Sundays), broadcast by Channel 9 in Buenos Aires under the direction of Orlando Marconi.

A year later, Gian Marco sang in Caracas on the TV show La Revista de los Sábados (The Saturday Magazine) impressing viewers that enjoyed a thirteen-year-old child singing a popular song titled "Eva Maria".

In 1981, at age 11, Gian Marco recorded a song for the musical Papito Piernas Largas (Daddy Long Legs).

During his youth, Gian Marco participated in a series of artistic events, singing and acting, developing his talents and preparing for what would become a successful career.

After finishing school, at the age of 18, Gian Marco traveled to Santiago de Chile to pursue a graphic design career.

From this recording the songs "Te Extrañaré" ("I Will Miss You") and "Dame un Beso" ("Give Me a Kiss") made the charts that year.

His fourth album, Señora, Cuénteme, is a tribute to canción criolla in which he affirms with his music the appreciation that he has for the feeling of native peoples like those in Perú.

This did not stop him from working on his own material, and he published A Tiempo (On Time) (2002) under the label Crescent Moon/Sony; this album was heard on the most significant radio stations in the world, and sold more than 50,000 copies in Spain.

On 2005 Gian Marco held a show at the Estadio Monumental de Perú to celebrate his career of 15 years, and had more than 40,000 spectators.

Several guests including Regina Alcover (his mother), Mauricio y Palo de Agua, Pelo Madueño and Antonio Cartagena, among others, clothed in this emotional Gianmarco concert.

In 2012 he was awarded in Mexico a Quadruple Platinum Certification by his label for selling over 400,000 copies of his albums in Latin America since the beginning of his career as an independent artist in 2006.

The singer has been making public the Latin American market as a composer, and also has written songs for Marc Anthony ("Este Loco Que Te Mira", "Hasta Que Vuelvas Conmigo", "Caminaré"), Pandora ("Mientras Tanto"), Jon Secada ("Amanecer", "Si No Fuera Por Ti"), Jaci Velasquez ("Bendito Amor"), Obie Bermúdez ("Me Cansé de Ti", "El Recuerdo"), Emmanuel ("En Otra Vida"), Alejandro Fernández ("Canta Corazón", "Tengo Ganas", "Dame Un Minuto", "No Se Me Hace Fácil"), and Gloria Estefan ("Hoy", "Tu Fotografía", "Mientras Tanto"), Luis Enrique ("Parte de este Juego"), among others.

Gian Marco has been important brand image as Pepsi, Inca Kola, currently one of the leading companies in mobile telephony in Peru Claro.