Theodore was born on January 24, 1900 in Nemyriv, a little town in Ukraine. He died on December 18, 1975 in California. Dobzhansky, in 1937, published “Genetics and the Origin of Species”. Here he was able to write the most important biology book in the 20th century. In 190, he made a genetic group at the Columbia University. Also in 1962, he wrote another book “Mankind Evolving” taht has changed the evolutionary theory.