John Conrad Nagel[citation needed] (March 16, 1897 – February 24, 1970) was an American film, stage, television and radio actor.

[2] After graduating from Highland Park College, Nagel left for California to pursue a career in the relatively new medium of motion pictures.

[4] In 1927, Nagel starred alongside Lon Chaney Sr., Marceline Day, Henry B. Walthall and Polly Moran in the now lost Tod Browning directed horror film, London After Midnight.

He was working so steadily that one night when he and his wife planned to go to the movies, he was in films playing at Grauman's, Loew's, and Paramount's theaters.

Fellow actors involved in the founding included: Mary Pickford, Douglas Fairbanks, Richard Barthelmess, Jack Holt, Milton Sills, and Harold Lloyd.

On April 22, 1961, again on television but in an acting role, he made a guest appearance on the popular courtroom drama Perry Mason, portraying the character Nathan Claver, an art collector and murderer, in the episode "The Case of the Torrid Tapestry".

[2] A spokesman for the office of the Chief Medical Examiner said that Nagel's death was "due to natural causes", more specifically, a heart attack and emphysema.

[13] In the M*A*S*H episode "Abyssinia, Henry" – which featured McLean Stevenson's final appearance on the show – Lt. Col. Blake finds out that his mother-in-law used his brown double-breasted suit to attend a costume party dressed as Conrad Nagel.