Louis Agassiz was a Swiss naturalist and palaeontologist, whose ideas shaped the modern understanding of Glacial Theory.
Barbara McClintock was an American geneticist. Her discovery of transposons revolutionised our understanding of genetics. She was awarded the Nobel Prize in Medicine or Physiology in 1983.
If he had a passport Charles Robert Darwin might have been described as a naturalist but he was one of the greatest of scientists, a titan among biologists. His theory of evolution by natural selection unified science, providing a coherent explanation for how the diversity of life came to be.
Although this is intended as a light-hearted guide to areas of science that might interest you, it serves to illustrate the inter-disciplinary nature of science.
