Background: Anton Grigorevich Rubinstein (Russian: Anton Grigor'evich Rubinshtein, tr. Anton Grigorevich Rubinshteyn; November 28 [O.S. November 16] 1829 - November 20 [O.S. November 8] 1894) was a Russian pianist, composer and conductor who became a pivotal figure in Russian culture when he founded the Saint Petersburg Conservatory. He was the elder brother of Nikolai Rubinstein who founded the Moscow Conservatory. As a pianist, Rubinstein ranks among the great 19th-century keyboard virtuosos.
Context: Rubinstein was born to Jewish parents in the village of Vikhvatinets in the Podolia Governorate, Russian Empire (now known as Ofatinti in Transnistria, Republic of Moldova), on the Dniestr River, about 150 kilometres (93 mi) northwest of Odessa. Before he was 5 years old, his paternal grandfather ordered all members of the Rubinstein family to convert from Judaism to Russian Orthodoxy. Although he was raised as a Christian, Rubinstein would later return to being atheist.  Rubinstein's father opened a pencil factory in Moscow. His mother, a competent musician, began giving him piano lessons at five, until the teacher Alexander Villoing heard and accepted Rubinstein as a non-paying student. Rubinstein made his first public appearance at a charity benefit concert at the age of nine. Later that year Rubinstein's mother sent him, accompanied by Villoing, to Paris where he sought unsuccessfully to enroll at the Paris Conservatoire.  Rubinstein and Villoing remained in Paris for a year. In December 1840, Rubinstein played in the Salle Erard for an audience that included Frederic Chopin and Franz Liszt. Chopin invited Rubinstein to his studio and played for him. Liszt advised Villoing to take him to Germany to study composition; however, Villoing took Rubinstein on an extended concert tour of Europe and Western Russia. They finally returned to Moscow in June 1843. Determined to raise money to further the musical careers of both Anton and his younger brother Nikolai, their mother sent Rubinstein and Villoing on a tour of Russia, following which the brothers were dispatched to Saint Petersburg to play for Tsar Nicholas I and the Imperial family at the Winter Palace. Anton was 14 years old; Nikolai was eight.  By 1867, ongoing tensions with the Balakirev camp, along with related matters, led to intense dissension within the Conservatory's faculty. Rubinstein resigned and returned to touring throughout Europe. Unlike his previous tours, he began increasingly featuring the works of other composers. In previous tours, Rubinstein had played primarily his own works.  At the behest of the Steinway & Sons piano company, Rubinstein toured the United States during the 1872-3 season. Steinway's contract with Rubinstein called on him to give 200 concerts at the then unheard-of rate of 200 dollars per concert (payable in gold--Rubinstein distrusted both United States banks and United States paper money), plus all expenses paid. Rubinstein stayed in America 239 days, giving 215 concerts--sometimes two and three a day in as many cities.  Rubinstein wrote of his American experience,  May Heaven preserve us from such slavery! Under these conditions there is no chance for art--one simply grows into an automaton, performing mechanical work; no dignity remains to the artist; he is lost.... The receipts and the success were invariably gratifying, but it was all so tedious that I began to despise myself and my art. So profound was my dissatisfaction that when several years later I was asked to repeat my American tour, I refused pointblank...  Despite his misery, Rubinstein made enough money from his American tour to give him financial security for the rest of his life. Upon his return to Russia, he "hastened to invest in real estate", purchasing a dacha in Peterhof, not far from Saint Petersburg, for himself and his family.  Villoing had worked with Rubinstein on hand position and finger dexterity. From watching Liszt, Rubinstein had learned about freedom of arm movement. Theodor Leschetizky, who taught piano at the Saint Petersburg Conservatory when it opened, likened muscular relaxation at the piano to a singer's deep breathing. He would remark to his students about "what deep breaths Rubinstein used to take at the beginning of long phrases, and also what repose he had and what dramatic pauses."  In his book The Great Pianists, former New York Times critic Harold C. Schonberg describes Rubinstein's playing as that "of extraordinary breadth, virility and vitality, immense sonority and technical grandeur in which all too often technical sloppiness asserted itself." When caught up in the moment of performance, Rubinstein did not seem to care how many wrong notes he played as long as his conception of the piece he was playing came through. Rubinstein himself admitted, after a concert in Berlin in 1875, "If I could gather up all the notes that I let fall under the piano, I could give a second concert with them."  Part of the problem might have been the sheer size of Rubinstein's hands. They were huge, and many observers commented on them. Josef Hofmann observed that Rubinstein's fifth finger "was as thick as my thumb--think of it! Then his fingers were square at the ends, with cushions on them. It was a wonderful hand." Pianist Josef Lhevinne described them as "fat, pudgy ... with fingers so broad at the finger-tips that he often had difficulty in not striking two notes at once." The German piano teacher Ludwig Deppe advised American pianist Amy Fay to watch carefully how Rubinstein struck his chords: "Nothing cramped about him! He spreads his hands as if he were going to take in the universe, and takes them up with the greatest freedom and abandon!"  Because of the slap-dash moments in Rubinstein's playing, some more academic, polished players, especially German-trained ones, seriously questioned Rubinstein's greatness. Those who valued interpretation as much or more than pure technique found much to praise. Pianist and conductor Hans von Bulow called Rubinstein "the Michelangelo of music." The German critic Ludwig Rellstab called him "the Hercules of the piano; the Jupiter Tonans of the instrument."
Question: Did he teach anyone else his technique?

Answer:
His mother, a competent musician, began giving him piano lessons at five,