Actor. He was a 20th century Italian actor, who made at least 71 films in his 33-year career. After completing his studies, he dedicated himself to acting, making his debut as actor in the theater company of his uncle Attilio Pietromarchi. Subsequently, he was acting in the shows of the Schwarz brothers and those of the Theater Za-Bum company. He then became an appreciated co-star in all of Totò's best shows, appearing alongside him not only in the theater but also in almost all his films. In 1928 he was one of the main actors of "Madama Follia" and "Mille e una donna" alongside Totò and Isa Bluette. In the 1940s, he was in "Quando meno te lo aspetti" by Galdieri with Anna Magnani. He was reconfirmed for the following theatrical season for one of the greatest theatrical successes of that period, "Volumineide," also by Galdieri and with the same actors. In 1944 he appeared with the same cast in "Che ti sei messo in testa?" After World War II, he continued to work alongside Totò in the theater, especially in the famous "Con un palmo di naso" in 1947 and alongside showgirls such as Elena Giusti, Isa Barzizza, and Gilda Marino. Starting from 1945, he appeared in many films alongside Totò. Among these, "Fifa and arena" in 1948 by Mario Mattoli, "Totò cerca moglie" by Carlo Ludovico Bragaglia and "Le sei mogli di Barbablu" , also by Bragaglia and both in 1950; "Totò a colori" in 1952 by Steno, "Lo spettacolo più comico del Mondo" in 1953 by Mario Mattoli, "Chi si ferma è perduto" in 1960 by Sergio Corbucci, "Totò contro i quattro" in 1963 by Steno. In 1956 he returned to the theater, making his debut as a protagonist in the comedy "Il malato per tutti" by Marotta and Randone. The following season he was hired by Peppino De Filippo's company with good acclaim especially for his performance in "Le metamorfosi di un suonatore ambulante" (1957). In 1967, shortly before Totò's death, Castellani was again at his side in a television series, "TuttoTotò," directed by Daniele D'Anza. This was an episodic show dedicated to the career of the comedian, in which the most famous sketches are re-proposed of his theatrical performances. After the death of Totò, Castellani decreased his professional commitments. In the last years of his life, he would appear almost exclusively on television, especially in performances of plays by Peppino De Filippo.