Mark served as the first Executive Director of the Illinois chapter of The Nature Conservancy.

The Illinois chapter convinced Chicago theater critics to ignore a production of The Clansman.

Faith in Place is the Illinois chapter of the national Interfaith Power & Light campaign.

In 1968, he went AWOL from the Army and co-founded the Illinois chapter of the Black Panthers.

After co-founding the Illinois chapter of the Black Panthers in 1968, he served as its "defense minister".

His mother is a trustee of the Illinois chapter of the Nature Conservancy.

He also has won awards by the Illinois chapters of the Associated Press and United Press International for his sportscasts.

The school claims that it is the organization's largest Illinois chapter, and the fifth largest in the nation.

That same year, Deputy Chairman Fred Hampton of the Illinois chapter conducted a meeting condemning sexism.

Fred Hampton, chairman of the Illinois chapter of the Black Panther Party, was killed on 12/4/1969 at the age of 21.