Harshad Mehta, born in 1954, rose to prominence in the Indian stock market during the late 1980s and early 1990s, establishing his own brokerage firm and earning the nickname 'Big Bull' for his role in driving stock prices up significantly. His methods involved manipulating the banking system through fraudulent ready-forward agreements, which ultimately led to the 1992 Indian stock market scam that resulted in his imprisonment and massive financial losses for several banks. After his dramatic downfall, regulatory measures were strengthened in the Indian stock market to prevent similar scams in the future.