威廉·欧奈尔，（William J.ONeil），欧奈尔是华尔街经验最丰富、最成功的资深投资人之一。他21岁白手起家，30岁时就买下纽约证券交易所的席次，并在洛杉矶创办执专业投资机构之牛耳的威廉·欧奈尔公司。他目前是全球600位基金经理的投资顾问，并且担任资产超过2亿美元的新美国共同基金的基金经理，也是《投资者商业日报》的创办人。该报成长迅速，是《华尔街日报》的主要竞争对手。

FROM THE AUTHOR OF THE BUSINESSWEEK , USA TODAY , AND WALL STREET JOURNAL BUSINESS BESTSELLER HOW TO MAKE MONEY IN STOCKS! Simple-to-follow strategies for making--and keeping--profits in today's perilous stock market More than 80 million investors lost 50 to 80 percent of their savings in the recent stock market crash. Investor's Business Daily publisher William J. O'Neil, however, was one of the first to see--and warn investors about--the dangers inherent in what had been, up to that point, a historic bull market run. Those who followed his counsel were able to sidestep devastating losses and emerge with their sizable bull market profits largely intact. In The Successful Investor, O'Neil steps up to tell all investors how they can make money and, more important, avoid losses in up markets, down markets, and everything in between. Showing how mistakes made in the recent market collapse were amazingly similar to those made in previous down cycles, O'Neil reveals simple steps investors can follow to avoid costly mistakes and: Buy only the best stocks at only the best times Follow a market-tested 3-to-1 Profit-and-Loss Percentage Plan Know when to sell for the biggest possible profit Recognize chart patterns that presage enormous market moves Manage a portfolio over time to maximize its returns William O'Neil has succeeded in virtually every market environment by following a stable, nonemotional investment plan. In his latest book, O'Neil explains how anyone can follow that plan to become a profitable long-term investor, regardless of market tides or turns. The Successful Investor will bring reason and welcome relief to all investors buffeted and bewildered by the perils and uncertainty of today's stock market.