In my opinion, the biggest difference in teachers is their willingness or unwillingness to work directly in the activity that is important in your life. I am a strong advocate of what has come to be called working in activity. I go to students' spas with them and to their pottery wheels. I get a kick out of direct application, but it is certainly not the only way. Many students are able to transfer what they learn in traditional Alexander teaching procedures to their everyday activities on their own.
People ask about certification of teachers.
You will sometimes be told that you should study only with a certified teacher. The fact is that there are wonderful teachers who are certified and there are wonderful teachers who are not. Barbara Conable teaches the Alexander Technique in Columbus, Ohio and is the author of How to Learn the Alexander Technique - A Manual for Students published by Andover Press in l996.