input: Rotblat returned to Britain to become senior lecturer and acting director of research in nuclear physics at the University of Liverpool. Most of his family had survived the war. With the help of a Polish man, his brother-in-law Mieczyslaw (Mietek) Pokorny had created false Polish Catholic identities for Rotblat's sister Ewa and niece Halina. Ewa, taking advantage of the fact that she was an ash blonde who, like Rotblat, spoke fluent Polish as well as Yiddish, smuggled the rest of the family out of the Warsaw Ghetto. Mietek, Rotblat's brother Mordecai (Michael) and Michael's wife Manya, Rotblat's mother Scheindel, and two Russian soldiers lived in a concealed bunker underneath a house near Otwock, in which Ewa and Halina lived with a Polish family. Displays of Polish anti-Semitism that she witnessed during the Warsaw Ghetto uprising embittered Ewa towards Poland, and she petitioned Rotblat to help the family emigrate to England. He therefore now accepted Chadwick's offer of British citizenship so he could help them escape from Poland. They lived with him in London for some time before becoming established. Halina would go on to graduate from Somerville College, Oxford and University College London, and become an editor of the Dictionary of National Biography.  Rotblat felt betrayed by the use of atomic weapons against Japan, and gave a series of public lectures in which he called for a three-year moratorium on all atomic research. Rotblat was determined that his research should have only peaceful ends, and so became interested in the medical and biological uses of radiation. In 1949, he became Professor of Physics at St Bartholomew's Hospital ("Barts"), London, a teaching hospital associated with the University of London. He remained there for the rest of his career, becoming a professor emeritus in 1976. He received his PhD from Liverpool in 1950, having written his thesis on the "Determination of a number of neutrons emitted from a source". He also worked on several official bodies connected with nuclear physics, and arranged the Atom Train, a major travelling exhibition for schools on civil nuclear energy.  At St Bartholomew's, Rotblat worked on the effects of radiation on living organisms, especially on ageing and fertility. This led him to an interest in nuclear fallout, especially strontium-90 and the safe limits of ionising radiation. In 1955, he demonstrated that the contamination caused by the fallout after the Castle Bravo test at Bikini Atoll nuclear test by the United States would have been far greater than that stated officially. Until then the official line had been that the growth in the strength of atomic bombs was not accompanied by an equivalent growth in radioactivity released. Japanese scientists who had collected data from a fishing vessel, the Lucky Dragon, which had inadvertently been exposed to fallout, disagreed with this. Rotblat was able to deduce that the bomb had three stages and showed that the fission phase at the end of the explosion increased the amount of radioactivity by forty times. His paper was taken up by the media and contributed to the public debate that resulted in the ending of atmospheric tests by the Partial Nuclear Test Ban Treaty.

Answer this question "How long did he teach?"
output: He remained there for the rest of his career, becoming a professor emeritus in 1976.

Question: Gregory James "Greg" LeMond (born June 26, 1961) is an American former professional road racing cyclist who won the Road Race World Championship twice (1983 and 1989) and the Tour de France three times (1986, 1989 and 1990). He is also an entrepreneur and anti-doping advocate. LeMond was born in Lakewood, California, and raised in ranch country on the eastern slopes of the Sierra Nevada mountain range, near Reno. He is married and has three children with his wife Kathy, with whom he supports a variety of charitable causes and organizations.

LeMond is a longtime vocal opponent of performance-enhancing drug use. He first spoke on-record against doping in cycling after winning the 1989 Tour de France. LeMond received intense criticism in 2001 when he publicly expressed doubts about the legitimacy of Lance Armstrong's Tour success after learning of his relationship with Dr. Michele Ferrari. His outspokenness placed him in the center of the anti-doping controversy.  LeMond has consistently questioned the relationship between riders and unethical sports doctors like Ferrari, and has pointed out that doping products ultimately victimize the professional cyclists who make use of them. Said LeMond: "When I speak out about doping people could translate it and think it was about the riders. Actually I feel like I am an advocate for the riders. I look at them as being treated like lab rats that are test vehicles for the doctors. The doctors, the management, the officials, they're the ones that have corrupted riders. The riders are the only ones that pay the price."  LeMond's most notable conflicts have been with fellow Tour riders Lance Armstrong and Floyd Landis. He has also been critical of Alberto Contador, the UCI, and its former president, Pat McQuaid. In December 2012, LeMond claimed that a change needed to be made at the head of leadership for the UCI, and stated if called upon he would be willing to take the position himself if necessary to lead cycling out of the mire of doping. Said LeMond: "It is now or never to act. After the earthquake caused by the Armstrong case another chance will not arise. I am willing to invest to make this institution more democratic, transparent and look for the best candidate in the longer term."  McQuaid rejected LeMond's call for new leadership and was dismissive of LeMond. Ultimately McQuaid was defeated in his bid for a third term by British Cycling president Brian Cookson at the September 2013 UCI Congress in Florence, Italy. Lemond had supported Cookson in the UCI Presidential battle.

Using a quote from the above article, answer the following question: Was there anything you can share about Greg LeMonds history?
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Answer:
LeMond is a longtime vocal opponent of performance-enhancing drug use.