In Washington, Andrew Jorgensen worked with Francesca Zambello on casting of such highlights as the 2016 “Ring” cycle and “Appomattox,” as well as the new operas commissioned for the annual American Opera Initiative. Jorgensen will only be the fourth leader in St. Louis’s 43-year history, after the founding director Richard Gaddes and his successor Charles MacKay, both of whom subsequently led the Santa Fe Opera.