He later learned that the anonymous donor was John A. Hannah, the president of Michigan State, and an occasional target of protests by civil rights activists including Green.

In 1965, Green received an apprenticeship in building trades from the Adolph Institute, a program designed to help minority women in the South with career development issues.

He previously worked Lehman Brothers, where he was a Managing Director in the fixed income department of the Washington, D.C., office, focusing on public finance.

[5] On March 3, 2015 the Attorney General for the District of Columbia filed suit against Green and another board member for having "grossly abused their positions as directors" and "contributed to the school's acting contrary to its non-profit purpose".

[9] In 1980, he was part of the Milton Friedman (PBS) Free to Choose panel discussion (volume 8 of 10) related to workers rights and the economy.

In 2019, he was portrayed by DeRon Horton on Drunk History: The Little Rock Nine Take on Segregation in Schools, which featured Amandla Stenberg.