Soon after, Vassalli partnered with Cesare Musatti and wrote a book on Psychoanalysis and Contemporary Art which ultimately began his career as a notable author.
Vassalli's works are established based on historical research relating to the evolution of religion, politics, and gender differences.
His novels are normally set in a certain historical context (Italy in the sixties, the Middle Ages, and times of counter-fascism).
Vassalli's works are known for their ability to represent the extremely simple yet effective nature of the characters of the novels in a sort of fictional manner.
This aspect, together with historical accuracy gives Vassalli’s works valuable qualities in terms of teaching them.