The School Director was the woman House met at WaldenWood pre-school when he was pretending to be a concerned doctor taking samples to treat a sick child but was actually scouting the location to give Rachel a heads-up on the other applicants in the Season 7 episode Carrot or Stick. She was portrayed by actress Grace Rowe.
The director was very concerned that one of the children was sick and attempted to find out who it was so she could apologize to the parents. However, House deflected the inquiry by claiming doctor-patient confidentiality. He then convinced her to leave the room by putting on a surgical mask.