<human>:  In the movie ‘A Beautiful Mind’, why did the professor say that he was a genius?
<bot>: The professor was referring to John Nash’s ability to solve problems that no one else could. He was a mathematician and an economist who won the Nobel Prize for economics in 1994. He had a mental disorder called paranoid schizophrenia, which caused him to hallucinate and hear voices. He was hospitalized multiple times and spent time in a psychiatric hospital. He was not considered a genius in his own time, but he was a very accomplished mathematician.