Question: The theatre practitioner that was born in Galicia, Austrian Poland claims to be the heir of what?

Context paragraphs:
History of Galicia (Eastern Europe): With the invasion of the Magyars into the heart of the Great Moravian Empire around 899, Slavic tribes of Vistulans, White Croats, and Lendians found themselves under Hungarian rule.  In 955 those areas north of the Carpathian Mountains constituted an autonomous part of the Duchy of Bohemia and remained so until around 972, when the first Polish (western Polans) territorial claims began to emerge.  This area was mentioned in 981 (by Nestor), when Vladimir the Great of Kievan Rus' claimed the area on his westward way.  In the 11th century the area belonged to Poland (1018–1031 and 1069–1080), then reverted to Kievan Rus'.  However, at the end of the 12th century the Hungarian claims to the principality turned up.  Finally Casimir III of Poland annexed it in 1340–1349.  Low Germans from Prussia and Middle Germany settled parts of northern and western Galicia from the 13th to 18th centuries, although the vast majority of the historic province remained independent from German and Austrian rule.

Method acting: Method acting is a range of training and rehearsal techniques that seek to encourage sincere and emotionally expressive performances, as formulated by a number of different theatre practitioners, principally in the United States, where it is among the most popular—and controversial—approaches to acting.  These techniques are built on the Stanislavski's "system" of the Russian actor and director Konstantin Stanislavski.  Though many have contributed to the development of the Method, three teachers are associated with "having set the standard of its success", though each emphasized different aspects of the approach: Lee Strasberg (the psychological aspects), Stella Adler (the sociological aspects), and Sanford Meisner (the behavioral aspects).  The approach was first developed when they worked together at the Group Theatre in New York.  All three subsequently claimed to be the rightful heirs of Stanislavski's approach.  His three major books were "An Actor Prepares", "Building a Character", and "Creating a Role".

Galicia–Volhynia Wars: Galicia–Volhynia Wars were several wars fought in the years 1340–1392 over the succession in the Principality of Galicia–Volhynia (in modern Poland and Ukraine).  After Boleslaw-Yuri II was poisoned by local nobles in 1340, both Grand Duchy of Lithuania and Kingdom of Poland advanced claims over the principality.  After a prolonged conflict, Galicia–Volhynia was divided between Poland (Galicia) and Lithuania (Volhynia) and the principality ceased to exist as an independent state.  Poland acquired a territory of approximately 52000 km2 with 200,000 inhabitants.

Moscow Art Theatre: The Moscow Art Theatre (or MAT) (Russian: Московский Художественный академический театр, МХАТ; "Moskovskiy Hudojestvenny Akademicheskiy Teatr", МHАТ ) is a theatre company in Moscow.  It was founded in 1898 by the seminal Russian theatre practitioner Konstantin Stanislavski, together with the playwright and director Vladimir Nemirovich-Danchenko.  It was conceived as a venue for naturalistic theatre, in contrast to the melodramas that were Russia's dominant form of theatre at the time.  The theatre, the first to regularly put on shows implementing Stanislavski's system, proved hugely influential in the acting world and in the development of modern American theatre and drama.

Theatre practitioner: Theatre practitioner is a modern term to describe someone who both creates theatrical performances and who produces a theoretical discourse that informs his or her practical work.  A theatre practitioner may be a director, a dramatist, an actor, or—characteristically—often a combination of these traditionally-separate roles.  "Theatre practice" describes the collective work that various theatre practitioners do.

Lee Strasberg: Lee Strasberg (born Israel Strasberg; November 17, 1901February 17, 1982) was a Polish-born American actor, director, and theatre practitioner.  He was born in a part of Galicia, Austrian Poland, in what is now Ukraine.  He co founded, with directors Harold Clurman and Cheryl Crawford, the Group Theatre in 1931, which was hailed as "America's first true theatrical collective".  In 1951, he became director of the nonprofit Actors Studio in New York City, considered "the nation's most prestigious acting school", and in 1966, was involved in the creation of Actors Studio West in Los Angeles.

Kingdom of Galicia and Lodomeria: The Kingdom of Galicia and Lodomeria, also known as Galicia or Austrian Poland, became a crownland of the Habsburg Monarchy as a result of the First Partition of Poland in 1772, when it became a Kingdom under Habsburg rule.  From 1804 to 1918 it was a crownland of the Austrian Empire.  After the reforms of 1867, it became an ethnic Pole-administered autonomous unit under the Austrian crown.  The country was carved from the entire south-western part of the Polish–Lithuanian Commonwealth.  Among the many ceremonial titles of the princes of Hungary was "ruler of Galicia and Lodomeria".

Franciszek Zachara: Franciszek Zachara ("b" Tarnów, Austrian Poland (now Poland), 10 December 1898; "d" Tallahassee, Florida, 2 February 1966) was a Polish pianist and composer who concertized extensively throughout Europe in the years leading up to 1928.  He was a professor of piano at a Polish conservatory from 1922-1928, and two American colleges from around this time until his death in 1966.  Zachara composed well over 150 works, including many works for piano solo, a piano concerto, a symphony, several works for band, and various chamber pieces.  The archive of his manuscripts is held at the Warren D. Allen Music Library at Florida State University.  Most of these manuscripts are originals (or copies) from the composer's own hand.

Eastern Galicia: Eastern Galicia, or Eastern Halychyna (Ukrainian: Східна Галичина ) is a geographical region in Western Ukraine (present day oblasts of Lviv, Ivano-Frankivsk and Ternopil) and Poland that has historic importance.  Galicia was formed within the Austrian Empire during the years 1772-1918.  Eastern Galicia now includes all of the Lviv and Ivano-Frankivsk Oblasts (regions) of Ukraine as well as Ternopil Oblast, with its northern strip bordering the Raions of Kremenets, Shumsk and Lanivtsi and the northern part of Zbarazh Raion.  The area of Eastern Galicia is about 46,800 km (18,100 sq miles).

Theodor Leschetizky: Theodor Hermann Leschetizky (22 June 183014 November 1915) (sometimes spelled Leschetitzky, in Polish: "Teodor Leszetycki" ) was a Polish pianist, professor and composer born in Łańcut, then Landshut in the kingdom of Galicia and Lodomeria, also known as Austrian Poland, a crownland of the Habsburg Monarchy.

Supporting paragraphs: Method acting Lee Strasberg
Answer: Stanislavski's approach