Who is Immanuel Wallerstein, and why am I quoting him?

  from Wikipedia: Immanuel Wallerstein (/ˈwɔːlərstiːn/; born September 28, 1930) is an American sociologist, economic historian and world-systems analyst, arguably best known for his development of the general approach in sociology which led to the emergence of his world-systems approach.   me: He  gave this as an Address, “The End of What Modernity?” to the President’s Forum,