How to Succeed in Private Banking—or Maybe Get in a Lot of Trouble

A legal fight shows the symbiotic relationship between the superwealthy and their money whisperers. When Moisés Cosío Espinosa’s car sputtered to a halt on a Los Angeles roadside, he knew who to phone for help, and it wasn’t a relative or the AAA. Instead, Cosío dialed a number three time zones away—the office of Iñigo…