Not OP, but I did find from the linked paper Richard Ladner, whose bio indicates a primary focus on accessibility:

https://www.cs.washington.edu/people/faculty/ladner/

Lauren Milne and Catherine Baker are both graduate students of his, so I'm going to guess that he was the professor mentioned. He is also one of two professors at the "Taskar Center for Accessible Technology":

https://tcat.cs.washington.edu/people