Civil War Roundtables (also referred to as Round Tables or CWRTs) are independent organizations that share a common objective in promoting and expanding interest in the study of the military, political and sociological history of the American Civil War.
 The oldest such group in the United States is The Civil War Round Table of Chicago, which was founded in 1941 and is based in Chicago, Illinois.
 The second and perhaps third oldest are the Civil War Round Table of Milwaukee (founded in 1947) and the Civil War Round Table of the District of Columbia (founded in 1951).
 There are hundreds of such organizations throughout the U.S., with some in other countries as well.
Herman Jacob Mankiewicz (November 7, 1897 – March 5, 1953) was an American screenwriter, who, with Orson Welles, wrote the screenplay for "Citizen Kane" (1941).
 Earlier, he was the Berlin correspondent for the "Chicago Tribune" and the drama critic for "The New York Times" and "The New Yorker".
 Alexander Woollcott said that Herman Mankiewicz was the "funniest man in New York".
 Both Mankiewicz and Welles received
Tony Marchant (born 11 July 1959, East London) is a British playwright and television dramatist.
 In 1982 he won the London Critics' Theatre Award for Most Promising Playwright for "The Lucky Ones" and "Raspberry".
 In 1999 he won the British Academy Television Awards Dennis Potter Award for services to television.
 His television work includes the acclaimed "Holding On" (1997), "Never, Never", starring John Simm and "Take Me Home".
Round table refers to the Central Round Table ("Zentraler Runder Tisch") that convened in East Berlin on December 7, 1989, the day after Egon Krenz, the new head of the Socialist Unity Party (SED) government, resigned.
 This Round Table, modeled after the Polish Round Table convened in April 1989, was initiated by the group Democracy Now.
 It was set up as a forum in which members of East German government organizations (such as the so-called block parties, trade unions, the women’s league, etc.) came together with representatives of the new citizens’ movements (such as Democracy Now, Democratic Awakening, and New Forum) to discuss and advance reforms in the German Democratic Republic (East Germany), advising the executive until new national elections could be held.
 There were 39 representatives at the Central Round Table, 33 with voting rights.
 Seventeen of them represented new oppositional groups and political parties, and 16 were from political parties and organizations that had been part of the official East German government.
 Three, representing women, consumers and environmentalists, had observer status.
 The final three members were the moderators, all clergymen, from the Protestant, Catholic and Methodist churches, who did not have the right to vote.
 At first most participants hoped to reform the East German government and thus retain the country’s independence, but as popular opinion moved towards rapid unification with West Germany, these hopes were dashed.
Alexander Humphreys Woollcott (January 19, 1887 – January 23, 1943) was an American critic and commentator for "The New Yorker" magazine and a member of the Algonquin Round Table.
Casanova is a British television drama serial, written by television playwright Dennis Potter.
 Directed by Mark Cullingham and John Glenister, the serial was made by the BBC and screened on the BBC2 network in November and December 1971.
 It is loosely based on Italian adventurer Giacomo Casanova's "Histoire de ma vie" ("Story of My Life"; 1780–92).
 It was Dennis Potter's first television serial, having previously written single plays for the BBC's "The Wednesday Play" and "Play for Today" series.
 Frank Finlay starred in the title role and was nominated for the best actor award at the 1972 BAFTA ceremony.
The Round Table is King Arthur's famed table in the Arthurian legend, around which he and his Knights congregate.
 As its name suggests, it has no head, implying that everyone who sits there has equal status.
 The table was first described in 1155 by Wace, who relied on previous depictions of Arthur's fabulous retinue.
 The symbolism of the Round Table developed over time; by the close of the 12th century it had come to represent the chivalric order associated with Arthur's court, the Knights of the Round Table.
The Woods Are Full of Cuckoos is a "Merrie Melodies" cartoon directed by Frank Tashlin, and released in December 1937.
 It is a parody/send-up of several different radio programs of the era, particularly the then-popular "community sing" programs.
 Author and critic Alexander Woollcott is parodied as "Owl Kott" in the cartoon, a parody that Tashlin would revisit in "Have You Got Any Castles?
" (1938).
William W. Woollcott (24 March 1876 — 2 February 1949) was an ink-and-paste manufacturer who lived in Baltimore, Maryland.
 Known as "Willie" he was the brother of Alexander Woollcott, and was married to Marie Bloede—daughter of Victor G. Bloede—a good friend of H. L. Mencken and a non-performing member of the Saturday Night Club.
 He was known for being a "wit and a bon vivant in his own right" but is best remembered for writing the anthem of the Saturday Night Club whose opening line Mencken included in his New Dictionary of Quotations: "I am a one hundred percent American!
 I am, God damn, I am!"
 The song took on a brief life of its own gaining "wide popularity among the unregenerate" during the 1920s.
Dennis Christopher George Potter (17 May 1935 – 7 June 1994) was an English television dramatist, screenwriter and journalist.

Question: What other occupation could said to have been shared by Dennis Potter the television dramatist and screenwriter and Alexander Woollcott the American critic and Round Table member?
Answer: journalist