Nassim Nicholas Taleb is a Lebanese–American author and scholar, whose research is primarily associated with problems of uncertainty, probability, and randomness. He is known for having proposed 'The Black Swan Theory.' It is a strategy he employed during his 20-year-career as a derivatives trader before he became a full-time writer. Using this strategy, he made money for various stakeholders, including himself. He gained fame for predicting the recession of the late 2000s and made a fortune out of it. He is the author of the five-volume philosophical essay on uncertainty titled 'Incerto.' Before he embarked on a writing career, he was a well-known options trader. He ventured into teaching, while he continued with his trading profession. He later retired from trading to become a full-fledged writer and scholar.