Instructions Full Game: These are multiple-choice quizzes with four possible answer choices that include all questions in a given set.     
Identify the following individual:

Lived: 1856 - 1922
A mathematician best known for work on stochastic processes, within which they described a sequence of possible events in which the probability of each event depends only on the state attained in the previous event.
Barbara McClintock
Andrey Markov
John Napier
Edward Witten