Findings, Publications, Contributions

http://www.achievement.org/autodoc/bibliography/Systematic_0

He contributed to the conceptual revolution that led to the modern evolutionary synthesis of Mendelian genetics, systematics, and Darwinian evolution, and to the development of the biological species concept.

He published a book titled Systematics and the Origin of Species. Nobody really knew the explanation of evolution in his time but he came up with an explanation and is written in his book. He explained that a species can evolve by mating in their own species, by being isolated and over time different genes will form and start evolution with that species. That was his theory on how an animal can evolve from its same ancestors without mingling with other species.