Jack Walker is the author of IVolatility.com’s (http://ivolatility.com/) Volatility Trading Digest using the name Jacktrader.
Jack is a former PSE options market maker and hedge fund manager.
IVolatility.com (http://ivolatility.com/) offers online stock options analysis and trading tools including the best options data and volatility charts in the business.
Current and previous issues of IVolatility Trading Digest along with a wealth of other useful articles and information for those interested in option trading are available at IVolatility.com. (http://ivolatility.com/)