Ellen Workman (ex stepmother) Won't go into it.
Tim Keel (ex friend) Natures living embodiment of a psychotic pathalogical liar and confidence man.
...and my third grade english teacher ... can't remember her name.
That was my exact thought when I saw the title of the thread...
Let's see... where should I begin? I'll stay away from the personal acquaintances, and go with the large historical figures...
Immanuel Kant -- The single man most responsible for the millions of deaths caused by war and dictatorship during the 20th century. He did it by destroying the intellectual revolution that began with the Renaissance and culminated in the Enlightenment. Quote: "I found that I had to deny knowledge in order to make room for faith."
Frederic Hegel -- Kant's accomplice. He translated Kant's epistemology into a political theory that inspired both communism and fascism.
Karl Marx -- Instead of trying to list all the bloody-handed communist dictators of the 20th century, I'll just name their direct intellectual ancestor.