The CEO of Goldman is responsible to it shareholders and technically, shareholders employ him. Although he could easily afford Patek, running around with one especially in light of the current regulation against brokers and banks it may not be a good idea. Ackman runs his own hedge fund and has a few billion of his own assets invested in the game with his shareholders. He can get away with wearing a Patek - especially has his return was superb last year and the few years before.