We provide direct evidence on the effect of financial expertise on investment. We identify a group of individual investors which have both finance expertise and day-to-day experience with financial markets: mutual fund managers – and compare their investment decisions to the decisions made by investors with similar characteristics, but lacking comparable financial expertise. We find no evidence that financial experts make better investment decisions: they do not outperform, do not diversify their risks better, and do not exhibit lower behavioral biases. Managers do much better in the stocks they share with their mutual funds; however, less than 1/4 of them have any mutual fund-related positions. Overall, our results demonstrate that for highly sophisticated investors expertise in finance does not improve investment decisions.