[1] The United States Holocaust Memorial Museum and the Jewish Partisan Educational Foundation[2] have recognized Gentili for his actions in the Italian Resistance in the Val d'Aosta during World War 2.

As a student in the late 1930s he formed a close, lasting friendship with the chemist and writer, Primo Levi, who knew him as "Euge" and with whom he shared a love of mountain climbing.

[1] The 1930s also saw the rise of Fascism and the Italian Racial Laws promulgated in 1938, which banned Jews from academia, politics, finance, the professional world, and most sectors of public and private life.

In early spring 1945, he moved to Rome, where, with Bruno Zevi, Cino Calcaprina, Saverio Muratori, Silvio Radiconcini, Mario Ridolfi, he co-founded Metron, the first architecture magazine published in Italy after the war.

[1] Towards the end of the 1990s the Studio Associato (Tedeschi with architects Gianni Calzà and Andrea Savio) began the restoration of vintage movie theaters in Milan.

He was released in a matter of weeks, after Gentili's father and girlfriend were able to raise the 30,000 lire needed to bribe the police superintendent in Turin to turn him free.

In Rome the spring of 1945, with Cino Calcaprina, Saverio Muratori, Silvio Radiconcini, Mario Ridolfi [it] and Bruno Zevi, he was co-founder and publisher of Metron, the first postwar architecture magazine in Italy, and served on its editorial board.

He continued his close association with Abitare until 1976, working with subsequent editorial directors, including Franca Santi, with whom he shared the role of editor-in-chief for a period.