Question: Were John Derek and Emilio Fernández both actors and directors?

Context articles: El revólver sangriento
The Pearl (film)
Comedy in the Golden Age of Mexican cinema
Enamorada (film)
Jaime Fernández (actor)
John Derek
Fernando Fernández (actor)
Río Escondido (1948 film)
Emilio Fernández
Rosa María Vázquez

El revólver sangriento (English: The Bloody Revolver ) is a 1964 Mexican western-drama film directed by Miguel M. Delgado, and starring Luis Aguilar, Lola Beltrán, Flor Silvestre, Emilio Fernández, Manuel Capetillo, Antonio Aguilar, and Irma Dorantes, as credited in the film's theatrical posters.
 The lead actors were credited in an unusual "rigorous appearance on the screen" style, where the film's main characters are not ordered by importance, but by on-screen appearance.
 Written for the screen by Alfredo Salazar, the film was a production of Cinematográfica Calderón and follows the account of a silver-plated revolver, which has a deadly curse and falls on the hands of different men.
La perla (The Pearl) is a 1947 Mexican/American film by the acclaimed director Emilio Fernández.
 The story is based on the novella "The Pearl" by John Steinbeck, who also co-wrote the screenplay for the movie.
Film became popular and well known in Mexico during “El Porfiriato” which represents the reign of Porfirio Díaz as dictator in Mexico.
 On August 6, 1896 the first films began to be released and were called/known as “Vistas”.
 In other words, views.
 At the time, the Catholic Church and the press were strongly opposed to the “vistas” because of the violence and women that was portrayed.
 They protested against them.
 Another important aspect was the projection of the Mexican Revolution to the public through film.
 It was a way for many to understand what was happening politically.
 Many agree that rather than the Mexican Revolution being a repression for the film industry, it was more of a motivator in the way it portrayed every battle and struggle.
 With the positive energy that the Mexico’s film industries was receiving, it began to evolve into “El Cine Sonoro” which translates to the cinema of sound.
 This was the era in which sound was being added into the silent films.
 Sadly, it was not as successful as many directors and film maker though it would be.
 Many failed to correctly synchronize the audio with the picture.
 Although to some extent it may have been unsuccessful, it is agreeable that it helped revolutionize film in Latin America.
 Mexico’s film industry takes its height post “El Cine Sonoro” to what is known as “The Golden Age”.
 Many film members consider this one of the most successful eras in the history of Mexican cinema.
 Many recognize the films of this era when they see black and white.
 It is also important to note that the films also portrayed social issues.
 Some of the most influential directors and actors are Emilio Fernández, Raul De Anda, Roberto B. Cervenna, Cantinflas, Vitola, Tin Tan, etc.
 The focus of this article will be on some of top grossing comedian actors of the time Cantinflas, Tin Tan, Clavillazo and others.
Enamorada ("Enamoured") is a 1946 Mexican drama film directed by Emilio Fernández and starring María Félix and Pedro Armendáriz.
 The film was remade in 1950 as "The Torch" with Armendáriz repeating his role alongside Paulette Goddard who was credited as an associate producer on the film.
Jaime Fernández Reyes (December 6, 1937 – April 15, 2005) was a Mexican actor.
 Over his career, he won 3 Silver Ariel awards - the Mexican equivalent of the Oscar - including one for what is arguably his best-known role, playing Friday in Luis Buñuel's "Robinson Crusoe".
 He appeared in over 200 films and served as the General Secretary of the Mexican actors' union for 11 years.
 His older brother was actor/director Emilio Fernández.
John Derek (born Derek Delevan Harris; August 12, 1926 – May 22, 1998) was an American actor, director and photographer.
 He appeared in such films as "Knock on Any Door", "All the King's Men", and "Rogues of Sherwood Forest".
 He was also known for launching the career of his fourth wife, Bo Derek.
Fernando Fernández "El Crooner de México" (1916–1999) was a Mexican actor and singer.
 He was born on November 9, 1916, in Monterrey, Mexico, and died in Mexico City, Mexico, on November 24, 1999.
 Fernando was the son of Eloisa Reyes.
 He was brother of the famous film director Emilio Fernández and actor Jaime Fernández.
 He was married to singer Lupita Palomera, who died in 2008.
 Fernando Fernández was known as "the Crooner of Mexico."
Río Escondido is a 1948 Mexican drama film directed by Emilio Fernández and starring María Félix.
Emilio "El Indio" Fernández (born Emilio Fernández Romo, ] ; March 26, 1904 – August 6, 1986) was a Mexican film director, actor and screenwriter.
 He was one of the most prolific film directors of the Golden Age of Mexican cinema in the 1940s and 1950s.
 He is best known for his work as director of the film "Maria Candelaria" (1944), which won the Palme d'Or award at the 1946 Cannes Film Festival.
 As an actor, he worked in numerous film productions in Mexico and in Hollywood.
Rosa María Vázquez Bustamante (born 5 August 1943) is a Mexican actress of film and television.
 A native of Tulancingo, Hidalgo, she made her film debut at the age of six in Emilio Fernández's "The Torch" (1950) starring Paulette Goddard and Pedro Armendáriz.
 She studied acting for three years at the National Association of Actors' Film Academy of Radio and Television, and was given her first starring role opposite Cantinflas in "El padrecito" (1964), her most famous film.