U.S. Supreme Court Chief Justice John Roberts will deliver the commencement address at La Lumiere School north of LaPorte, where he graduated in 1973.
Roberts, who grew up in Long Beach, will speak at the May 24 graduation ceremony, which starts at 10 a.m. at the school at 6801 N. Wilhelm Road.
His eighth-grade teacher at Notre Dame School, Dorothea Liddell, said Monday she plans to attend.
Her son, Robert, a radiologist in Seattle and La Lumiere alumnus, made the arrangements for her to have seat.
She speculated Roberts might tell the graduates to work hard and be honest.
"I've wondered what he will say. I have no idea," said Liddell, who retired from education in 1978.
According to the school's website, Roberts' speech kicks off the private college preparatory school's 50th anniversary year.
The event is not open to the general public.
It's open mainly to family members of graduates and seating in Marsch Gymnasium, where the commencement will be held, is very limited, school officials said.
Free tickets are required to get into the ceremony and all of the tickets have been issued, said Colleen Kennedy, director of advancement at the school.
"We're thrilled, obviously," said Kennedy.
Roberts is the 17th and current Chief Justice of the United States, serving in that capacity since 2005 after being nominated by President George W. Bush to fill a void created by the death of Chief Justice William Rehnquist.
Liddell said what she remembers most about Roberts is his hard work and dedication in the classroom.
"He was a real student. There was no fooling around. He wanted to get the job done," said Liddell.