The family of one former student sued last week over what it says were "repeated" abuses by Reinhardt during the 2007-08 school year.
The suit states the teen is under psychiatric care as a result of the assaults and will "likely never" fully recover, according to a report in the Connecticut Post.
The suit claims Reinhardt was able to "engage in pedophilia" with the boy and other minors because he was allowed to invite boys to spend the night in his apartment on campus.
"This boy was sent to a boarding school as his first time away from home," the lawyer for the student told the Post. "Within a month of being there, he was molested and the molestation continued. It has been devastating for him and just as devastating for his parents."
Susan Smith, a lawyer for another student, said she will file a similar suit sometime this week.
Reinhardt was arraigned earlier this month on charges including sexual assault and risk of injury to minors. He posted bond and is expected back in court on Sept. 1.