Knall and Fall as Detectives (German: Knall und Fall als Detektive) is a 1953 Austrian-West German comedy film directed by Hans Heinrich and starring Hans Richter, Rudolf Carl and Ingrid Lutz.
 It was made as a sequel to the 1952 film "Knall and Fall as Imposters".
Charles, Dead or Alive (French: "Charles mort ou vif") is a 1970 Swiss drama film directed by Alain Tanner.
Requiem: A Hallucination (Portuguese: Requiem: uma alucinação ) is a 1991 novel by the Italian writer Antonio Tabucchi.
 Set in Lisbon, the narrative centres on an Italian author who meets the spirit of a dead Portuguese poet.
 Tabucchi wrote the book in Portuguese.
 Alain Tanner directed a 1998 film adaptation, also called "Requiem".
Messidor is a 1979 French-Swiss drama film directed by Alain Tanner.
 It was entered into the 29th Berlin International Film Festival.
Hans Richter (6 April 1888 – 1 February 1976) was a German painter, graphic artist, avant-gardist, film-experimenter and producer.
 He was born in Berlin into a well-to-do family and died in Minusio, near Locarno, Switzerland.
Jonah Who Will Be 25 in the Year 2000 (French: "Jonas qui aura 25 ans en l'an 2000" ) is a 1976 Swiss film directed by Alain Tanner and written by Tanner and John Berger.
 The location of the shooting was Geneva.
Hans Richter (János Richter) (4 April 18435 December 1916) was an Austrian–Hungarian orchestral and operatic conductor.
Alain Tanner (born 6 December 1929) is a Swiss film director.
The Salamander (French: La Salamandre ) is a 1971 Swiss drama film directed by Alain Tanner.
 The film was selected as the Swiss entry for the Best Foreign Language Film at the 45th Academy Awards but was not accepted as a nominee.
Fourbi is a 1996 French-Swiss drama film directed by Alain Tanner.
 It was screened in the Un Certain Regard section at the 1996 Cannes Film Festival.

Question: Who directed the most movies, Hans Richter or Alain Tanner?
Answer: Alain Tanner