He studied theatre and in 1986 began acting regularly, especially on television productions such as the Fantaghirò series and for the cinema with a small role in The Name of the Rose.

[1] Rossi Stuart came back to act in the theatre with Re Lear and with the most important Italian actors, like Turi Ferro in the work Il visitatore.

In 2004, he played in Le Chiavi di Casa, as a young father that attempts to forge a relationship with his teenage, handicapped son when he met him for the first time.

Rossi Stuart wrote the screenplay, directed and acted in the 2006 film Anche libero va bene.

Rossi Stuart's following film was Angel of Evil, based on the life of 1970s Italian gangster Renato Vallanzasca.

In the September 2010 Italian issue of Vanity Fair, Kim spoke about his latest film and personal life, confirming that he is single and expressed the wish to become a father.