The Professional Commodity Trader
Stanley Kroll is a legendary commodity trader.  He is the author or co-author of several books on futures trading.  His first book in 1974 was The Professional Commocity Trader.Shortly after this book was completed, Kroll closed out a huge wheat position which he had held for months, closed out his business and retired from futures trading at the age of 40.  For years, he enjoyed his profits and in so doing, did what most big winners never do:  take time to smell the roses with their profits before the market takes them back.  Kroll did, eventually succumb the temptation to return to trading, around 1980.