Former Michigan State University President Lou Anna K. Simon will testify in front of a U.S. Senate panel on Tuesday afternoon.
Simon, who was subpoenaed, will discuss what she knew about Larry Nassar and when.
Also expected to testify in front of the subcommittee is former USA Gymnastics President Steve Penny.
Nassar was sentenced to 40 to 175 years in prison in January in Ingham County Court after he pleaded guilty to assaulting seven people, both in the basement of his home and at his office on the MSU campus.
Judge Rosemarie Aquilina told him at the time, "I just signed your death warrant."
Just a week later, Nassar was also sentenced to 40 to 125 years in prison in Eaton County after pleading guilty to molesting young women at Twistars, a gymnastics club. Nassar will first have to serve 60 years in federal prison for child pornography crimes.