She is not a “managing director” there. She’s a regional director of a division, which is a far lower position.
Cruz met his wife while working on the George W. Bush presidential campaign of 2000. Cruz’s wife is currently head of the Southwest Region in the Investment Management Division of Goldman, Sachs & Co. and previously worked in the White House for Condoleezza Rice and in New York as an investment banker.
http://en.wikipedia.org/wiki/Ted_Cruz