Andrei Andreyevich Markov

Andrei Andreyevich Markov (1856–1922) Markov was actually a student and disciple of Pafnuty Lvovich Chebyshev (1821–1894).

markov worked on limit theorems for sums of random variables

in 1913 Markov published 'An example of the statistical investigations of the poem "Eugene Onegin"' in which he used a markov model to study the sequence of vowels and consonants in Russian words