- Developed his ideas on heredity in the mid-19th century (around 1856-1865).
- Presented his findings in 1865, but they went largely unnoticed until the early 20th century.
Charles Darwin
- Developed his theory of evolution by natural selection in the mid- to late-19th century (around 1838-1859).
- Published his influential book, "On the Origin of Species," in 1859.