That might be tough to pull off. Certainly request them if they are on the ship you are on.
But given that most of us book our trips a long ways in advance, could be hard to tell if he will still be with Disney, whether he will be on his break, which ship he is on. And I can't speak to how
Disney Cruise Line operates but in other industries companies don't disclose IF and WHERE someone is working for fear of stalkers or violating privacy laws.