I can recommend Dagmar as a CFII. When Doug chimes in, he can speak first hand about Dagmar, he's flown acro with her.Dagmar is a former German national aerobatic team member. Don't know anyone who has flown with any on this list who can attest to their qualities as an instructor. If you are just looking for basic upset training, the requirements aren't too steep. Just make some calls, chat about your goals, and go with whoever gives you "warm and fuzzies".