yah, based on part 3, where it's mentioned that Mao had an exhibition in Los Angeles, it seems like either Zervignon or Flores would fit the profile - both had exhibitions in LA and are in fields that are close enough to Harbin's work. Probably one's Mao and the other is Hortense. Most dissertations are available online (and usually mention the committee members in the front matter), although this one might be withheld for obvious reasons.

EDIT: this is pure speculation, and not of much utility. I just happen to be eating lunch and clicking around.