Who is Iris Saltzman from Many Lives, Many Masters and what is their importance?

Iris Saltzman is the reputable, psychic astrologer who constructed an "astrological wheel" based on Catherine's date, time, and place of birth. She used this data, as well as her intuition, to transmit details of past lives. Catherine entrusts Iris to give her a second opinion of all that took place during her treatment under Weiss. According to Weiss, Iris confirmed Catherine as having been a Spanish woman, whose name began with the letter L. She was also able to see snippets of lives Weiss did not touch up during Catherine's hypnotic state.