Information:  - Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Düsseldorf.  - A private investigator (often abbreviated to PI and informally called a private eye), a private detective, or inquiry agent, is a person who can be hired by individuals or groups to undertake investigatory law services. Private detectives/investigators often work for attorneys in civil and criminal cases.  - Ein Fall für zwei (""A case for two"") is a German television series, which premiered on 11 September 1981 on ZDF. The series, set in Frankfurt am Main, features two main characters who solve crimes: a defense attorney and a private investigator.  - An actor (or actress for females; see terminology) is a person who portrays a character in a performance. The actor performs "in the flesh" in the traditional medium of the theatre, or in modern mediums such as film, radio, and television. The analogous Greek term is, literally "one who answers". The actor's interpretation of their role pertains to the role played, whether based on a real person or fictional character. Interpretation occurs even when the actor is "playing themselves", as in some forms of experimental performance art, or, more commonly; to act, is to create, a character in performance.  - Claus Theo Gärtner (born 19 April 1943) in Berlin, Germany is a German television actor mainly known for his role as Josef Matula, the main character in the German detective show series "Ein Fall für Zwei" ("A Case For Two").  - Television or TV is a telecommunication medium used for transmitting moving images in monochrome (black-and-white), or in color, and in two or three dimensions and sound. It can refer to a television set, a television program ("TV show"), or the medium of television transmission. Television is a mass medium, for entertainment, education, news, and advertising.  - Zweites Deutsches Fernsehen, usually shortened to ZDF, stylized as 2DF since 2001, is a German public-service television broadcaster based in Mainz, Rhineland-Palatinate. It is run as an independent nonprofit institution, which was founded by all federal states of Germany ("Bundesländer"). ZDF is financed by television licence fees and advertising revenues.   - Hermann Josef Matula ( played by Claus Theo Gärtner ) is a character on the German detective show Ein Fall für Zwei . Matula is one of the two main characters on the show , and the only character to have appeared in every episode so far . Matula is a former police officer who has become a private detective instead . He always works in co-operation with a defense attorney , who is the other main character on the show . The character of the defense attorney has changed several times in the lifetime of the show . In chronological order , the attorneys have been Dieter Renz , Rainer Franck , Johannes Voss and Markus Lessing , who ( as of 2005 ) is the current attorney . The former attorneys left the show because of various reasons : Renz retired due to his old age , Franck accepted a job as a teacher at a law school , and Voss was shot dead by an escaping criminal . In the beginning of the first episode in 1981 he mentioned his birthplace to be Oberhausen and his age to be 31 years . So he was going to celebrate his 60th birthday in 2010 . Despite this advanced age , Matula is in good physical condition and can put up quite a fight when challenged . According to research done by a German fan of the show , Matula has been beaten up 37 times and knocked unconscious 7 times . Still he somehow manages to stay healthy and fit for his duty . Matula 's method of detective work is very direct and hands - down . While the attorney he works with handles the juridistical part of the current case , Matula gets his hands dirty and tracks down the people he suspects of being involved in the crimes . This frequently involves him posing as a reporter or other similar profession to avoid discovery . Matula 's direct , action - oriented way of work often gets him into trouble with the police . He has been arrested 12 times , and the entire plot of one episode centered on Matula being suspected of murder and having to escape the police into Austria . Despite his toughness , Matula is a skilled cook and has a great deal of charm...    What is the relationship between 'josef matula' and 'private investigator'?
The answer to this question is:
occupation