The literal translation of Chef is "chief" or "leader" not "cook". Most chef/owners concentrate more on the running of the entire business, not just the running of the kitchen. Most chef/owners today have Chef de Cuisines or Executive Sous Chefs who have been by their side for years and can execute the menu just as well as the actual "Chef". Frankly, working in a busy kitchen is a young man's game. You're talking about 12 plus hours in hot kitchens while trying to coordinate hundred of plates to scores of guests at dozens of tables, at the same time.