I think you can ask the staff. I know all the teachers there are at least Grade 8. This is the min. requirement for teaching piano.
My girl is also learning piano in Parsons after finished the 兒童piano class there. I ask the staff to introduce a good teacher to me. I pick up my kid after lesson and the teacher will brief me what she has taught in the lesson. She is a patient and good teacher. She over run the lesson about 5-10min everytime because my girl is the last student. : :