Acclaimed historian H. W. Brands brings them back to life: J. P. Morgan, who stabilized a foundering U.S. Treasury in 1907; Alexander Hamilton, who founded the first national bank, and Nicholas Biddle, under whose directorship it failed; Jay Cooke, who helped to finance the Union war effort through his then-innovative strategy of selling bonds to ordinary Americans; and Jay Gould, who tried to corner the market on gold in 1869 and as a result brought about Black Friday and fled for his life.