The third man was Oliver Bailey, the greatest living American mathematician. Certainly the most famous, the most prominent, the most visible. The go-to guy, not that anyone went to mathematicians very often. But if they did, Bailey was their man. Richly deserved, Tyler thought. Justified by a spectacular body of work across an absurdly wide range of interests. Really a historic figure. The fourth man in the room was the president of the United States.