Matthias Jakob Schleiden (1804-1881) was a German botanist and co-founder of the cell theory. Schleiden was educated at Heidelberg and practiced law in Hamburg but soon developed his hobby of botany into a full-time pursuit. Schleiden preferred to study plant structure under the microscope. While professor of botany at the University of Jena, he wrote Contributions to Phytogenesis, in which he stated that the different parts of the plant organism are composed of cells. Thus, Schleiden became the first to formulate what was then an informal belief as a principle of biology equal in importance to the atomic theory of chemistry. He also recognised the importance of the cell nucleus, discovered in 1831 by the Scottish botanist Robert Brown, and sensed its connection with cell division. Schleiden was one of the first German biologists to accept Charles Darwin's theory of evolution. He became professor of botany at Dorpat, Russia, (today Tartu, Estonia) in 1863.he died in 1881.