Hire people with people/management skills into managerial positions. Don't base it on seniority. Eliminate the useless; Just because a group leader is a good friend of her reporting-to-manager doesn't mean she should keep her job; Be ware of married couples, one of them a group leader, reporting to the same manager.
I think BD is an excellent company to work for, especially as a clinician. They give the clinicians a great deal of autonomy and professional independence. In my opinion it's easy to support BD products because I honestly believe that they are the highest quality and the best available.
When you buy a company, you need to incorporate the new company with the head office and not keep separate. And please have patience. Our company ICPA survived 22 years with old management but BD could not keep it more than two years. within two years after they bought ICPA, they were done with it.