Fabrice Tourre

Fabrice P. Tourre is best known as "Fabulous Fab," the former Goldman Sachs trader whose e-mails about the mortgage crisis became a symbol of Wall Street hubris and will now highlight the government's case against him. As the economy was on the brink of collapse, e-mails show Mr. Tourre joked to a girlfriend that he sold toxic real estate bonds to "widows and orphans."

But an inner circle of friends knows Mr. Tourre from very different dispatches — e-mail updates he sent from Africa during a stint as a volunteer. It was there that "Fabulous Fab," a nickname he earned from a friend in New York, became known simply as "Breezy."