Question: Who wrote the original work that the opera Joseph Kaiser made his debut was based on?

Context paragraphs:
Bertha (Rorem): Bertha is an opera in one act, with music by Ned Rorem to an English libretto by Kenneth Koch, an original work parodying Shakespeare's histories.  Rorem wrote the work originally at the request of the Metropolitan Opera (Met) Studio in the 1960s, intended as an opera for children.  However, the Met studio rejected the work.  The work was premiered at Alice Tully Hall in New York City on November 25, 1973 with Beverly Wolff in the title role.

William J. Kaiser: William Joseph Kaiser (born September 15, 1955) is a professor and former department chair of Electrical Engineering at the University of California, Los Angeles (UCLA).  He is a winner of 2007 Gold Shield Prize and has been a Fellow of American Vacuum Society since 1994.  He is the director of Actuated Sensing & Coordinated Embedded Networked Technologies research group at UCLA and co-director of UCLA Wireless Health Institute.

Victorian burlesque: Victorian burlesque, sometimes known as travesty or extravaganza, is a genre of theatrical entertainment that was popular in Victorian England and in the New York theatre of the mid 19th century.  It is a form of parody in which a well-known opera or piece of classical theatre or ballet is adapted into a broad comic play, usually a musical play, usually risqué in style, mocking the theatrical and musical conventions and styles of the original work, and often quoting or pastiching text or music from the original work.  Victorian burlesque is one of several forms of burlesque.

Joseph Kaiser: Joseph Kaiser is a Canadian operatic tenor.  In 2005, he won second prize in Plácido Domingo's Operalia International Opera Competition while competing as a baritone.  The judges were keen to his talents and potential as a tenor, and proposed that he make the switch to tenor.  He has performed as a soloist with the New York Metropolitan Opera, making his debut in October 2007 as Roméo in Charles Gounod's "Roméo et Juliette".  In November he returned to the Met sing the role of Tamino Mozart's "Die Zauberflöte".

Reiko Yoshida: Reiko Yoshida (吉田 玲子 , Yoshida Reiko ) is a Japanese screenwriter and manga artist.  She has written and supervised numerous screenplays for anime series, live-action dramas and films.  Her major works include "Kasumin", "Kaleido Star", "Aria", "Maria-sama ga Miteru", "D.Gray-man", "K-On! ", "Bakuman" and "Girls und Panzer".  In more recent works, she has supervised the screenplays for "Majestic Prince", "Non Non Biyori", "A Town Where You Live", "Tamako Market", "Yowamushi Pedal" and "Castle Town Dandelion".  In films, she wrote the screenplay for "The Cat Returns", the original films that would make up "", and the film adaptations of Osamu Tezuka's "Buddha", the last one's second film was given a stamp of approval by the Dalai Lama.  She wrote the story for the manga series "Tokyo Mew Mew" along with illustrator Mia Ikumi.  Among her works, she was recognized for Best Screenplay/Original Work for "Girls und Panzer" at the Tokyo Anime Award Festival in 2014, and she won another Best Screenplay/Original Work award in 2017.

Carl Kaiser: Carl Joseph Kaiser (born April 8, 1927 in Winnipeg, Manitoba) is a Canadian former professional ice hockey player.  Kaiser was born into a large family and, as a youth, demonstrated athletic ability, particularly in hockey.

Roméo et Juliette: Roméo et Juliette ("Romeo and Juliet") is an opera in five acts by Charles Gounod to a French libretto by Jules Barbier and Michel Carré, based on "The Tragedy of Romeo and Juliet" by William Shakespeare.  It was first performed at the Théâtre Lyrique (Théâtre-Lyrique Impérial du Châtelet), Paris on 27 April 1867.  This opera is notable for the series of four duets for the main characters and the waltz song ""Je veux vivre"" for the soprano.

Fierro (film): Fierro, also known as Martín Fierro: La Película ("Martín Fierro: The Movie"), is a 2007 Argentine animated film directed by Liliana Romero and Norman Ruiz.  Its script is an original work of Horacio Grinberg and Roberto Fontanarrosa and is based on the poem Martín Fierro, written by José Hernández between 1872 and 1879.  The characters' designs are also original work by Fontanarrosa.  It was released on November 8, 2007.

Trouble in Tahiti: Trouble in Tahiti is a one-act opera in seven scenes composed by Leonard Bernstein with an English libretto by the composer, dedicated to Marc Blitzstein.  It is the darkest among Bernstein's "musicals", and the only one for which he wrote the words as well as the music.  The opera received its first performance on 12 June 1952 at Bernstein's Festival of the Creative Arts on the campus of Brandeis University in Waltham, Massachusetts to an audience of nearly 3,000 people.  The NBC Opera Theatre subsequently presented the opera on television in November 1952, a production which marked mezzo-soprano Beverly Wolff's professional debut in the role of Dinah.  Wolff later reprised the role in the New York City Opera's first staging of the work in 1958.  The original work is about 40 minutes long.

Kaiser Permanente: Kaiser Permanente ( ; KP) is an integrated managed care consortium, based in Oakland, California, United States, founded in 1945 by industrialist Henry J. Kaiser and physician Sidney Garfield.  Kaiser Permanente is made up of three distinct but interdependent groups of entities: the Kaiser Foundation Health Plan, Inc. (KFHP) and its regional operating subsidiaries; Kaiser Foundation Hospitals; and the regional Permanente Medical Groups.  As of 2014, Kaiser Permanente operates in eight states and the District of Columbia, and is the largest managed care organization in the United States.

Supporting paragraphs: Joseph Kaiser Roméo et Juliette
Answer: William Shakespeare