"Hoover brought a corporate executive's sensibility to the White House. Roosevelt brought a politician's. Hoover as president frequently dazzled visitors with his detailed knowledge and expert understanding of American business. "His was a mathematical brain," sad his admiring secretary, Theodore Joslin. "Let banking officials, for instance, come into his office and he would rattle off the number of banks in the country, list their liabilities and assets, describe the trend of fiscal affairs, and go into the liquidity, or lack of it, of individual institutions, all from memory." Roosevelt, in contrast, impressed his visitors by asking them to draw a line across a map of the United States. He would then name, in order, every county through which the line passed, adding anecdotes about each localities political peculiarities."