CHICAGO (CBS) — Visitation was held Sunday for Dr. Conrad Worrill, an African-American leader in civil rights and education.

Worrill passed away on Wednesday, June 3. He was 78.

READ MORE: 1 Dead, 2 Injured In I-57 Expressway Shooting Near 119th Street

Cook County Board President Toni Preckwinkle was among the many who came out Sunday to pay their respects.

Dr. Worrill was a hero to many – having worked tirelessly to help young people.

READ MORE: 101st Airborne 'Screaming Eagles' Soldiers To Help Staff United Center Mass Vaccination Site

He joined the Inner Cities Studies – later Urban Communities Studies – faculty at Northeastern Illinois University in 1976 and taught at the university for more than 40 years.

Dr. Worrill was also chairman of the National Black United Front, a consultant for the Million Man March in 1995, and a participant in the United Nations World Conference Against Racism in 2001.

Dr. Worrill also hosted a show on WVON radio.

MORE NEWS: Brent Seabrook Ending Playing Career After 15 Years With Chicago Blackhawks

A private funeral is scheduled for Monday.