Alexander Kovalevsky Scientist
Alexander Onufrievich Kovalevsky (Polish: Aleksander Kowalewski, 7 November 1840 in Vārkava, Vitebsk Governorate (present-day Vārkava Municipality, Latvia) – 1901) was a Russian embryologist of Polish descent, who studied medicine at the University of Heidelberg and became professor at St Petersburg. He showed that all animals go through a period of gastrulation.
