Who is Kamala Harris' estranged 'Marxist' economist father Donald?

While Kamala Harris campaigns from her West Wing office, her 86-year-old father, Donald J. Harris, owns a home less than a mile away. Despite the proximity, however, there is no record of Donald meeting his famous daughter in the White House. Nor are there any recent public photographs of the pair together. So just who is the man who could be dad to the first woman president of the United States?