Debuting in television in 1954, Soriano soon starred in leading roles in Argentine premieres of Paddy Chayefsky's The Tenth Man, Marcel Achard's Voulez-vous jouer avec moi?

The slow pace of liberalization in the dictatorship's policy towards the arts pushed artists led by playwrights Osvaldo Dragún and Carlos Gorostiza to create an Argentine Open Theatre movement in 1980, to which Soriano was one of the first and best-known adherents.

A return to democracy in 1983 allowed Argentine artists to create works critical of the climate of abuses prevalent during the preceding dictatorship and Soriano was cast as the lead in Mercedes Frutos' 1984 film version of Adolfo Bioy Casares' Otra esperanza ("Another Hope"), a horror-fantasy narrative set in a factory where energy is generated from human bodies - a timely metaphor for much of the repression that had targeted industrial workers.

A similarly bucolic backdrop set the stage for his role as a dying idealist in Diego Arsuaga's El último tren ("The Last Train", 2002), an Uruguayan film indicting unpatriotic business deals.

Soriano has also turned to his Jewish roots in theatre works such as Jeff Baron's Visiting Mr. Green, where he teaches an unsympathetic parole officer a lesson in kinship and in cinema such as in the Chilean film, El brindis ("The Toast", 2007), where a Jewish-Chilean patriarch struggles to bring his disparate family closer.