in 1924, he formed the state street investment corporation. which was the second open-end mutual fund legally incorporated but the first to operate. he was one of the first practitioners of fundamental equity research including on-site management interviews and also among the first to favor the price-earnings ratio in his valuation work over dividend yield. these innovations contributed to outstanding investment performance for decades. during the 1920s he uncovered the unethical practices of certain other funds. due to the fame this gained him he was able to influence important new deal securities legislation such as the revenue act of 1936 and the investment company act of 1940.