However, he continued his primary and secondary studies without giving importance to his great artistic passion. By becoming an adult worked as a medical visitor and then he became the Head of Public Relations for a pharmaceutical laboratory.
Later, decided to enter the world of politics and at the end of the eighties he became councilor of the Jesús María district, a position he returned to later, he belonged to the political party known as PPC and was responsible for the Entertainment Commission and the Library.
In those years, the television program led by Augusto Ferrando was very popular, who discovered his talent in acting and encouraged him to participate in one of his contests, winning out of 100 participants.
With Ferrando started working on the radio where Rossini began to make his first imitations of politicians of the time such as Ramírez Lazo or Manuel Prado.
Until now he continues working in radio he has been in RPP, conducting the Loquibambia program and then for 5 years he took charge of The National Joke Championship.
On television, he had a great participation in comic programs such as Teleloquibambia, then in Estrefalario, in El Tornillo and in the popular Risas y Salsa program where for the first time he imitated a politician, Alfonso Grados Bertorini.
Years later and following his work on the radio, he joined other Peruvian comedians such as Fernando Armas placeholder image and Hernán Vidaurre, creating the program Los Chistosos in RPP, which also made it to the small screen as 24 minutes and 24 minutes.
Dedicated entirely to radio work, he decided after several years to return to television in 2008 with Ponte al día, again with his friends and colleagues Vidaurre and Armas.
Guillermo Rossini has been married to Eloisa Effio since 1969 and has two children, and today he continues to work in radio.