Yet it was the work of naturalist Alfred Russel Wallace that pushed Darwin to finally release his theory.

VOA: special.2009.12.01

Another naturalist,Alfred Russel Wallace, had independently written a paper that contained ideas similar to Darwin's concerning evolution.

VOA: special.2009.02.25

We might call this the Wallace problem, for Alfred Russel Wallace, who discovered natural selection independent of Charles Darwin.

NEWYORKER: A Man of Letters

Scientist Alfred Russel Wallace, who proposed the theory of evolution by natural selection with Charles Darwin, corresponded with the great and good of 19th Century society.

BBC: Search for Alfred Russel Wallace's 19th Century letters

Letters written by scientist Alfred Russel Wallace, who proposed the theory of evolution by natural selection with Charles Darwin, will be published online for the first time.

BBC: Alfred Russel Wallace's 19th Century letters go online