Task: Question Answering
Input (English): Passage: Like his predecessor Rafael Kubelík, and his successor Colin Davis, Solti found his early days as musical director marred by vituperative hostility from a small clique in the Covent Garden audience. Rotten vegetables were thrown at him, and his car was vandalised outside the theatre, with the words "Solti must go!" scratched on its paintwork. Some press reviews were strongly critical; Solti was so wounded by a review in The Times of his conducting of The Marriage of Figaro that he almost left Covent Garden in despair. The chief executive of the Opera House, Sir David Webster, persuaded him to stay with the company, and matters improved, helped by changes on which Solti insisted. The chorus and orchestra were strengthened, and in the interests of musical and dramatic excellence, Solti secured the introduction of the stagione system of scheduling performances, rather than the traditional repertory system. By 1967 The Times commented that "Patrons of Covent Garden today automatically expect any new production, and indeed any revival, to be as strongly cast as anything at the Met in New York, and as carefully presented as anything in Milan or Vienna".The company's repertory in the 1960s combined the standard operatic works with less familiar pieces. Among the most celebrated productions during Solti's time in charge was Schoenberg's Moses and Aaron in the 1965–66 and 1966–67 seasons. In 1970, Solti led the company to Germany, where they gave Don Carlos, Falstaff and Victory, a new work by Richard Rodney Bennett. The public in Munich and Berlin were, according to the Frankfurter Allgemeine Zeitung, "beside themselves with enthusiasm".Solti's bald head and demanding rehearsal style earned him the nickname "The Screaming Skull". A music historian called him "the bustling, bruising Georg Solti – a man whose entire physical and mental attitude embodied the words 'I'm in charge'." Singers such as Peter Glossop described him as a bully, and after working with Solti, Jon Vickers refused to do so again. Nevertheless, under Solti, the company was recognised as having achieved parity with the greatest opera houses in the world. Queen Elizabeth II conferred the title "the Royal Opera" on the company in 1968. By this point Solti was, in the words of his biographer Paul Robinson, "after Karajan, the most celebrated conductor at work". By the end of his decade as music director at Covent Garden Solti had conducted the company in 33 operas by 13 composers.In 1964 Solti separated from his wife. He moved into the Savoy Hotel, where not long afterwards he met Valerie Pitts, a British television presenter, sent to interview him. She too was married, but after pursuing her for three years, Solti persuaded her to divorce her husband. Solti and Valerie Pitts married on 11 November 1967. They had two daughters. 
Question: What is the name of the person that wrote Georg Solti's biography?
Output (English): Paul Robinson.