Instructions 20Q Game: These are similar to full games, but for quizzes larger than 20 questions it will randomly select 20 questions from within the set. This is a quick way to get in some studying of a topic.     
Identify the following philosopher:

(1813-1855) Danish philosopher and theologian widely considered to be the first existentialist philosopher. Work focuses on Christian ethics and the institution of the Church. Wrote many "Upbuilding Discourses" under his own name.
B. F. Skinner
Zeno of Elea
Søren Kierkegaard
Ralph Waldo Emerson