I Suggest you look them up on-line, look at what they’ve done etc. and see if what they do, their style of playing, repertoire… match what YOU want to do.
There are many excellent harp teachers out there, but an excellent teacher for someone else doesn’t necessarily equate to an excellent teacher for you.
I also suggest sending them an e-mail, get in touch with them personally, ask them questions about their department and themselves. It’ll give you a much better view of who your going to be dealing with for the next 4-5 years.
Best of Luck