LW1 - If this is a consistent pattern and if you have not previously steered him wrong on similar issues, then your husband is a fool and you should not be married to him. There is no real mutual respect or trust between you two. To be threatened by someone he supposedly loves in an area where they clearly have expertise is boneheaded. 

My wife is a nurse and I am happy to have her as the point person in our family to direct our family (nuclear and extended) on medical issues. One person can't be an expert on all things so I'm happy to have her as a resource. Different people have different strengths. That's part of what makes us a good team.