The Profile: The billionaire who thrives in crisis & J.P. Morgan's crime ring

In 2009, glassblowing artist Jim McKelvey lost a sale in his St. Louis-based studio because he couldn't accept American Express cards. Fueled by the frustration of losing that sale, he got the idea for his next company.

McKelvey asked himself: Why is it so difficult and costly to accept credit card payments? He called his friend Jack Dorsey to see if the…