Chang says he decided to pursue his Ph.D as a promise to his father and had planned to join Larry and Sergey upon the completion of his Ph.D. Upon graduation in 2002 when he contacted Larry and Sergey he apparently got the brush off. Larry and Sergey had their people respond to Chang’s emails.
I have no idea if this is true. It could be a claim made up by Chang for various reasons. If he really was a founder, what made him wait so long? I have contacted Hubert Chang to get his side of the story. I have also contacted professor Rajeev Motwani (whom I have known for many years) and he, too, advised me and introduced me to some big shots. His expertise in databases, data mining, information retrieval, and web searching far surpass most people’s comprehension of the subject."