Meet the Mathematical Genius in my Basement
"In the mid-1980s, Simon Norton was considered one of the great mathematical prodigies of the 20th century. 
He worked on a hyper-dimensional math problem so complex it was called "The Monster." But then things fell apart for Norton, and he ended up in a dingy basement packed with bulging plastic bags and piles of bus timetables."
"And he may have remained there in obscurity if it weren't for his upstairs neighbor in Cambridge, England: biographer Alexander Masters. Actually, Simon Norton was Masters' landlord. The two men developed a kind of friendship, and they even traveled together. Their time together is documented in Masters' new book, Simon: The Genius in My Basement."
"'Here he was, this extraordinary genius, the envy of everyone around him,' Masters says. 'And now he is a person who wanders around on trains and buses, whom some people will cross the street in order to avoid.'"