From Christoper Browne's presentation to Columbia Business School in 2000:
Four years ago, Walter Schloss walked into my office with a piece of paper on which he had typed out his then 40-year investment record of approximately 20% annually compounded. To my knowledge, this is an individual record without peer. I broke the record into decades and sent it around to the members of one of the investment boards on which I sit. I wrote that if we had found Walter ten years ago, we would not have hired him despite a 30- year record of compounding at 20% per year. He was nearly 70, he had no real succession plan, no staff, and no computers. His research library consisted of borrowing my copy of Value Line. And we would have missed another ten years of compounding at 20% per year.