Enron and John Olson The Congressional investigation into the collapse of Enron has focused recently on the relationship between Enron and the major Wall Street investment banks. One issue that investigators have been looking at is whether the banks' stock recommendations are fatally compromised because of pressure from other parts of the organization. The experience of John Olson, a former research analyst at Merrill Lynch, has been at the center of the Senate investigation. Olson left Merrill Lynch after investment bankers at the firm complained that his ratings of Enron were costing them tens of millions of dollars. NPR's Wade Goodwyn spoke with Olson and has this report.