This way, you can find out if there is something in your interviewing style that is getting in the way of communicating your message. Clearly, it would be very helpful to you to find out why you are not being invited back for a second interview. With that information, you can then strategize ways to overcome the objections. It is appropriate to ask either the human resources manager you spoke with or the hiring manager. You might also consider contacting the school where you earned your MBA to ask about the services they offer to their alumni.
Many business schools have centers that offer career management programs.
If yours has one, perhaps they could help you sharpen your interviewing technique. There may even be the opportunity to videotape a practice interview. Career centers may also have the resources to help you to identify leads for job opportunities. If you received your MBA outside of Boston, I suggest you call the school and find out if it has a reciprocity agreement with an institution in Boston. You could then have access to its services.