Josef is the receptionist at Blofeld's sham clinic, Piz Gloria. Josef meets Bond at the entrance to the clinic and schedules an appointment for Bond, as "Sir Hilary," to see the doctor. Josef is often seen skulking around in the background durring the first half of the film including putting in a phone call to Blofeld that Bond's ally Campbell is scaling the mountain, Shortly after this, he is seen on the phone again, presumably ordering Campbell's execution.
Bond later encounters Josef again during his escape from Piz Gloria. Josef, now dressed in full SPECTRE gear, attacks Bond, who knocks him out after a short fight. Bond stashes Josef's unconscious body gagged and tied up in a locker full of skiing equipment.
It is unknown what happened to Josef, and although Piz Gloria was taken and most SPECTRE guards where killed, it is possible he was the only one taken prisoner although he is not seen afterwards.