John Petrie (vice president, managing director and head trader for WCHS.) Oversees the daily operations of the Ag Marketing division of Walsh Trading Inc. John began trading in 1998, specializing in advanced options strategies, inter-market spreads and arbitrage between the open-outcry and the electronic futures and options markets. He has spent the last 6 years working directly with top agricultural and livestock producers and end-users to help to manage their risk associated with today’s volatile markets.