Dorothy Jean Tillman II during commencement at Arizona State University in Tempe on May 6.

Dorothy Jean Tillman II’s participation in Arizona State University’s May 6 commencement was the latest step on a higher-education journey the Chicago teen started when she took her first college course at age 10.

In between came associate’s, bachelor’s and master’s degrees.

When Tillman successfully defended her dissertation in December, she became the youngest person — at age 17 — to earn a doctoral degree in integrated behavioral health at Arizona State, associate professor Leslie Manson told ABC’s “Good Morning America” for a story Monday.

“It’s a wonderful celebration, and we hope … that Dorothy Jean inspires more students,” Manson said. “But this is still something so rare and unique.”

Tillman, called “Dorothy Jeanius” by family and friends, is the granddaughter of former Chicago Alderwoman Dorothy Tillman.