Question: which actor also was a screenwriter, John H. Auer or Pietro Germi?

Context articles: John H. Auer
A Stranger in Paso Bravo
Pietro Germi
Un maledetto imbroglio
Cineriz
Serafino (film)
Ottavio Alessi
Commedia all'italiana
Divorce Italian Style
Black 13

John H. Auer (August 3, 1906 in Budapest, Hungary – March 15, 1975 in North Hollywood, Los Angeles) was a Hungarian-born child actor who, on coming to the Americas in 1928, became a movie director and producer, initially in Mexico but, from the early 1930s, in Hollywood.
A Stranger in Paso Bravo (Italian: "Uno straniero a Paso Bravo" , Spanish: "Los pistoleros de Paso Bravo" , also known as "Paso Bravo") is a 1968 Italian-Spanish Spaghetti Western film directed by Salvatore Rosso.
 It was the first and only film directed by Rosso, who had previously been assistant of a number of directors, notably Pietro Germi.
 The film was remade in 1969 by Antonio Margheriti as "And God Said to Cain"; despite being the same story and having the main characters sharing the same names, the two films list different screenwriters.
 The film underperformed at the Italian box office, grossing only 34 million lire.
Pietro Germi (] ; 14 September 1914 – 5 December 1974) was an Italian actor, screenwriter, and director.
 Germi was born in Genoa, Liguria, to a lower-middle-class family.
 He was a messenger and briefly attended nautical school before deciding on a career in acting.
Un maledetto imbroglio also known as "The Facts of Murder" is a 1959 Italian crime film mystery directed by and starring Pietro Germi with Claudia Cardinale.
 The film is based on the novel by Carlo Emilio Gadda "Quer pasticciaccio brutto de via Merulana".
 The film was restored and re-released in 1999 both in Italy and the USA.
Cineriz was an Italian media company, involved primarily in the production and distribution of films, founded in the early 50s by the businessman Angelo Rizzoli.
 The company catalogue counts also many movies directed by Federico Fellini, Gillo Pontecorvo, Luchino Visconti, Michelangelo Antonioni, Pier Paolo Pasolini, Pietro Germi, Roberto Rossellini and Vittorio De Sica.
Serafino (also known as "Serafino ou L'amour aux champs" in France) is a 1968 Italian film directed by Pietro Germi.
Born in Cammarata, Province of Agrigento, Alessi entered the film industry in 1940 as an assistant director.
 In 1945 he started an intense career as a screenwriter, alternating between genre films and art films and collaborating with Pietro Germi, Franco Rossi, Folco Quilici and Luciano Salce, among others.
 He also directed two films in the 1960s.
Commedia all'italiana (i.e. "Comedy in the Italian way"; ] ) or Italian-style comedy is an Italian film genre.
 It is widely considered to have started with Mario Monicelli's "I soliti ignoti" ("Big Deal on Madonna Street") in 1958 and derives its name from the title of Pietro Germi's "Divorzio all'italiana" ("Divorce Italian Style", 1961).
Divorce Italian Style (Italian: "Divorzio all'italiana" ) is a 1961 Italian comedy film directed by Pietro Germi.
 The screenplay was written by Ennio De Concini, Pietro Germi, Alfredo Giannetti, and Agenore Incrocci; based on the novel "Un delitto d'onore" ("Honour Killing") by Giovanni Arpino.
 It stars Marcello Mastroianni, Daniela Rocca, Stefania Sandrelli, Lando Buzzanca, and Leopoldo Trieste.
 The movie won the Academy Award for Best Writing, Story and Screenplay - Written Directly for the Screen; Mastroianni was nominated for Best Actor in a Leading Role (Marcello Mastroianni) and Germi for Best Director.
Black 13 is a 1953 British crime drama film directed by Ken Hughes and starring Peter Reynolds, Rona Anderson, Patrick Barr and John Le Mesurier.
 The film is a remake of the 1948 Italian film "Gioventù perduta" (a.k.a. "Lost Youth") by Pietro Germi.
 It was made by Vandyke Productions.