He said he met "Jack Stones" at a robotics convention last July and was contacted online by the young man.
"Over a couple of months, there were e-mails back and forth," he said.
In the e-mails, the professor said, Kaiser claimed he had abusive parents who were human traffickers and he had been homeless, beaten with iron pipes in shelters for being transgender. The professor said Kaiser asked him for help.
"I found an incredible kid, who had a vision to go to school and college and he drew me in," he said. "I became really involved and emotional with it. My plan was to work through the courts and get custody."
When police told him Kaiser's identity, he said, "I was floored. All that night and next day I was disoriented. I feel like I was rescuing this kid."
While local police said the professor was not currently under investigation, the FBI said it was looking further into the association between the two men.
Kaiser is scheduled to appear in court for a preliminary hearing Oct. 26.
All involved said the case was unusual.
"I have been in this business 35 years and first time I've seen anything like it," Hudgens said. "What I am so pleased about is the staff never got excited, never got blown away by anything and went step by step through their procedures and the procedures worked."
ABC Information Specialist Brad Martin contributed to this report."