威廉·歐奈爾，（William J.ONeil），歐奈爾是華爾街經驗最豐富、最成功的資深投資人之一。他21歲白手起傢，30歲時就買下紐約證券交易所的席次，並在洛杉磯創辦執專業投資機構之牛耳的威廉·歐奈爾公司。他目前是全球600位基金經理的投資顧問，並且擔任資産超過2億美元的新美國共同基金的基金經理，也是《投資者商業日報》的創辦人。該報成長迅速，是《華爾街日報》的主要競爭對手。

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.