While trading warrants and options in the 1970s and 1980s, John Bollinger focused on volatility as the key variable. From volatility he created his own approach... » 

While trading warrants and options in the 1970s and 1980s, John Bollinger focused on volatility as the key variable. From volatility he created his own approach to trading brands. In this text, he explains how this technical analysis tool came to be and how it is used. «