Question: Clinton Marius started his career with the lead role in the one-act play by whom?

Context paragraphs:
Words, Words, Words: Words, Words, Words is a one-act play written by David Ives for his collection of six one-act plays, "All in the Timing".  The play is about Kafka, Milton, and Swift, three intelligent chimpanzees who are put in a cage together under the experimenting eye of a never seen Dr. Rosenbaum, a scientist testing the hypothesis that three apes hitting keys at random on typewriters for an infinite amount of time will almost surely produce Shakespeare's play "Hamlet" (a variation on the infinite monkey theorem).  The show's title is a phrase quoted from "Hamlet".  The performance comprises the ape characters humorously confronting and conversing with each other in order to understand the purpose of the exercise put upon them.

Amahl and the Night Visitors: Amahl and the Night Visitors is an opera in one act by Gian Carlo Menotti with an original English libretto by the composer.  It was commissioned by NBC and first performed by the NBC Opera Theatre on December 24, 1951, in New York City at NBC studio 8H in Rockefeller Center, where it was broadcast live on television from that venue as the debut production of the "Hallmark Hall of Fame".  It was the first opera specifically composed for television in America.

Photograph 51 (play): Photograph 51 is an award-winning play by Anna Ziegler.  "Photograph 51" opened in the West End of London in September 2015.  The play focuses on the often-overlooked role of x-ray crystallographer Rosalind Franklin in the discovery of the double helix structure of DNA while working at King's College London.  This play won the 3rd "STAGE" International Script Competition in 2008.  The title comes from "Photo 51", the nickname given to an X-ray diffraction image taken by Raymond Gosling in May, 1952, under the supervision of Rosalind Franklin.  The one-act play runs for 95-minutes with no intermission.

Karnabharam: Karnabharam or "The Anguish of Karna" (literally: "The Burden of Karna") is a Sanskrit one-act play written by the Indian dramatist Bhasa, an Indian playwright complimented even by the famous Kalidasa in the beginning of his play Malavikagnimitram .  The play describes the mental pain of Karna on the previous day of the Kurukshetra War.  Karnabharam is essentially the retelling of an episode of the Indian epic Mahabharata but the story is presented in a different perspective in the play.  It is perhaps the only potential tragedy in the classic Sanskrit literature, presented in a form that comes closest to the "Vyayoga" (Sanskrit: व्यायोग) form of one-act play.  That is so perhaps because the Natya Shastra ordains the playwrights to create plays for recreation, and essentially create happy endings .  In Karnabharam, the tragedy does not occur on-stage (Unlike Urubhanga, a tragedy that shows Duryodhana dying - again, written by Bhasa).  Karnabharam shows the valiant, generous, righteous Karna riding out towards the battle-ground, where his death under heart-wrenching circumstances is certain.  The basic plot of this play is inspired by Mahabharata.

Landscape (play): Landscape is a one-act play by Harold Pinter that was first broadcast on radio in 1968 and first performed on stage in 1969.  The play shows the difficulties of communication between two people in a marriage.  This is illustrated through the two characters who appear to be talking to one another though neither seems to hear the other.  The dialogue resembles two independent monologues.  The play is often studied, read, and performed alongside "Silence", another one-act play published soon after "Landscape".  Both plays mark a change in Pinter's style, with echoes of the work of Samuel Beckett.  In both plays nothing happens, the action of the plays is brought to a halt putting an added emphasis on the role of the dialogues and monologues that take place.  As one critic put it "nothing happens but much is explored".

One-Act Play Festival: A One-Act Play Festival is a festival of one-act plays, often in a competitive format.  Plays are usually presented over a weekend, week or longer period.  If the festival includes a competition, plays are normally judged by an independent adjudicator, such as a member of GODA.

Sci-Fest LA: Sci-Fest LA (The Los Angeles Science Fiction One-Act Play Festival) is an annual festival featuring one-act plays in the science fiction genre, held in Los Angeles.  It was co-founded by veteran Los Angeles theatre producers Michael Blaha and Lee Costello and actor David Dean Bottrell (“Boston Legal”), and was first held at the ACME Comedy Theatre in Los Angeles on May 6, 2014.

One-act play: A one-act play is a play that has only one act, as distinct from plays that occur over several acts.  One-act plays may consist of one or more scenes.  In recent years, the 10-minute play has emerged as a popular subgenre of the one-act play, especially in writing competitions.  The origin of the one-act play may be traced to the very beginning of drama: in ancient Greece, "Cyclops", a satyr play by Euripides, is an early example.

Clinton Marius: Clinton Marius (born 20 August 1966 in Pietermaritzburg) is a South African writer and performer.  He made his first professional appearance singing the lead role in Menotti's opera, "Amahl and the Night Visitors" at age twelve.  His poetry has been published internationally, while he is also known for penning several plays and collections of short stories, as well as the fictional biography of a guru, "Sunshine - The Booklet of the Biography".

'Op o' Me Thumb: 'Op o' Me Thumb is a 1904 one-act play by the English authors Frederick Fenn and Richard Pryce.  It was produced at the Court Theatre, London, on 13 March 1904, in a double bill with Robert Browning's "A Soul's Tragedy".  It transferred to the St James's Theatre on 24 April 1904.  The leading role of Amanda was played by Hilda Trevelyan.  The play was staged in New York in 1905 with Maude Adams as Amanda.  It was filmed in 1920 as "Suds", starring Mary Pickford in the role created by Trevelyan.

Supporting paragraphs: Clinton Marius Amahl and the Night Visitors
Answer: Gian Carlo Menotti