question: Are Paul Bartel and William C. McGann both directors? 
answer: yes
context: Title: William C. McGann
  Passage: William C. McGann (April 15, 1893 – November 15, 1977) was an American film director.  He directed 52 films between 1930 and 1940.  He was born in Pittsburgh, Pennsylvania and died in Los Angeles, California.
  Title: Marry the Girl (1937 film)
  Passage: Marry the Girl is a 1937 American romantic comedy film directed by William C. McGann.  The 68 minute film, set at a newspaper syndicate, was written by Sig Herzig and Pat C. Flick, shot by cinematographer Arthur L. Todd, and was produced by Bryan Foy and Jack L. Warner under the Warner Bros. banner.
  Title: Shelf Life (film)
  Passage: Shelf Life is a 1993 film directed by Paul Bartel.  The final film Bartel directed before he died in 2000, it stars O-Lan Jones, Andrea Stein and Jim Turner.
  Title: Paul Bartel
  Passage: Paul Bartel (August 6, 1938 – May 13, 2000) was an American actor, writer and director.  Bartel was perhaps most known for his 1982 hit black comedy "Eating Raoul", which he wrote, starred in and directed.
citations: William C. McGann Paul Bartel