By the way, many people think that if they are giving the aggressive bird a 'time out' by setting them in their lap is just confounding the bird. By allowing a bird to be on top of you, you are giving dominance to him, he is the 'top dog' and higher in the hierarchy and now has little fear of...
Showing dominance can be a strong deterrent to aggressive behavior. He sees your husband as an equal and a threat to his territory. He still needs his area but hubby needs to be 'above' him.