Question: Who, Umberto Lenzi or Lowell Sherman, was an American actor and film director, who succumbed to pneumonia after a brief illness?

Context articles: Umberto Lenzi
Kenneth Thomson (actor)
You Never Know Women
Lowell Sherman
Lawful Larceny
Bruce Lee Fights Back from the Grave
Arthur Roberts (editor)
Bachelor Apartment
High Stakes (1931 film)
Tommy Atkins (director)

Umberto Lenzi (born 6 August 1931) is an Italian film director who was very active in Italian international co-production peplums, Eurospy films, spaghetti westerns, Macaroni Combat movies, Poliziotteschi films, cannibal films and giallo murder mysteries (in addition to writing many of the screenplays himself).
Kenneth Thomson (January 7, 1899 – January 26, 1967) was an American character actor active during the silent and early sound film eras.
 He, along with his wife Alden Gay, was a founding member of the Screen Actors Guild.
 The group was founded after meetings held at the Thomsons' home during 1933.
 During his brief twelve-year career in front of the camera, he appeared in over 60 films.
 After appearing in several Broadway plays during the early and mid-1920s, Thomson would make his film debut with a starring role in 1926's "Risky Business".
 Over the next four years, he would appear in over a dozen films, in either starring or featured roles.
 In 1930 alone he would appear in ten films, half of which were in starring roles, such as "Lawful Larceny", which also starred Bebe Daniels and Lowell Sherman (who also directed), and "Reno", whose other stars were Ruth Roland and Montagu Love; the other half would see him in featured roles as in "A Notorious Affair", starring Billie Dove, Basil Rathbone, and Kay Francis.
 During the rest of the 1930s, he would appear in numerous films, mostly in either supporting or featured roles, such as "The Little Giant" (1933), starring Edward G. Robinson and Mary Astor, and "Hop-Along Cassidy" (1935), starring William Boyd; although he occasionally would have a starring role, as in opposite Harold Lloyd in 1932's "Movie Crazy".
You Never Know Women is a 1926 American silent romantic drama film from director William Wellman that was produced by Famous Players-Lasky and distributed by Paramount Pictures.
 The stars of the picture are Florence Vidor, Lowell Sherman, and Clive Brook.
Lowell J. Sherman (October 11, 1885 – December 28, 1934) was an American actor and film director.
 At a time when it was highly unusual, he was both the actor and director on several films in the early 1930s, before completely transitioning to the role of director.
 At the height of his career, after scoring huge successes with his direction of the films "She Done Him Wrong" and "Morning Glory" (which starred Mae West and won her first Academy Award for Katharine Hepburn respectively), he succumbed to pneumonia after a brief illness.
Lawful Larceny is a 1930 American melodramatic film, directed by Lowell Sherman from Jane Murfin's screenplay.
 The screenplay, a melodrama, was based on the play of the same name by Samuel Shipman, which originally was a comedy.
 It starred a staple of the early RKO stable, Bebe Daniels, along with Kenneth Thomson, Olive Tell and Lowell Sherman, who reprised the role he had created in the original Broadway play.
 This film was a remake of the 1923 silent film version of the same name, produced by Famous Players-Lasky Corporation
Bruce Lee Fights Back From The Grave, released originally as Visitor of America (Hangul: 아메리카 방문객 ; Hanja: 아메리카 訪問客 ; RR: "Amelika bangmungaeg " ), is a 1976 Bruceploitation movie starring Bruce Lee impersonator and tae kwon do instructor Jun Chong (using the alias Bruce K.L. Lea).
 The film was directed by Lee Doo-yong, though persistent misinformation claims that the movie was directed by Italian horror director Umberto Lenzi.
 The poster's artwork was very common among exploitation films at the time.
Arthur Roberts July 17, 1890 – February 5, 1961), also known as Arthur E. Roberts, was an American film editor who edited over 100 films during his almost 30 year career.
 He began ending towards the end of the silent era of the film industry, his first film being 1927's "The College Hero", directed by Walter Lang.
 His last film was Republic's "Lay That Rifle Down" in 1955, after which he spent a brief period as the editor for the television series, "Lassie", before retiring in 1956.
 During his career he would work with many famous directors, including Frank Capra (on several films, including "The Donovan Affair"), Lowell Sherman (on "The Royal Bed"), William Seiter (on several films, including "Way Back Home"), Edward Cline (on "Cracked Nuts"), George Cukor ("A Bill of Divorcement"), Dorothy Arzner (the first female member of the DGA, on "Christopher Strong"), Anthony Mann ("Strangers in the Night"), George Archainbaud ("Girls of the Big House"), Fritz Lang ("House by the River"),
Bachelor Apartment is a 1931 American pre-Code RKO comedy/romance film directed by and starring Lowell Sherman as a womanizing playboy who falls in love with Irene Dunne's honest working girl.
 The credits for the film, and all sources from that time show that the film was based on a story by New York playwright John Howard Lawson, the screenplay was adapted by J. Walter Ruben.
 However, Lawson would later claim that the final screenplay had not been altered from what he had originally written.
 The cast features Mae Murray (a former silent film star, who was attempting to make a come-back in talkies), Norman Kerry and Ivan Lebedeff.
High Stakes is a 1931 American Pre-Code comedy drama produced and released by RKO Pictures.
 The picture was directed by Lowell Sherman who also stars and marks the last starring screen appearance of silent screen diva Mae Murray.
 It is based on a 1924 Broadway play that starred Sherman playing the same role he plays in this film.
Tommy Atkins was an American director of the silent and early sound film eras.
 Born on July 18, 1887 in Springfield, Massachusetts, he would make his entrance into the film industry as the assistant director to Ralph Ince on the 1920 silent film, "Out of the Snows".
 It would be another eight years before he would make another film, again as assistant director, this time for FBO Pictures, on another silent film, "Crooks Can't Win".
 He'd work as the assistant director on another sixteen films between 1928 and 1934, the most notable of which would be 1933's "Morning Glory", directed by Lowell Sherman and starring Katharine Hepburn and Douglas Fairbanks Jr..
 In 1934 he would be given the chance to helm his first picture, "The Silver Streak", which was one of the top money-makers for RKO Pictures that year.
 He would only direct two more films, the second of which, "Hi, Gaucho!
", he would also write the story for.