The first African-American officer selected for astronaut training in 1961, Ed Dwight, eventually never flew for NASA, but he did become the oldest person to make a space flight -- at 90 years old -- in 2020. In the interim, what was his life's work?

The first African-American officer selected for astronaut training in 1961, Ed Dwight, eventually never flew for NASA, but he did become the oldest person to make a space flight -- at 90 years old -- in 2020. In the interim, what was his life's work?