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Thomas Huxley

5/4/1825 - 6/29/1895

Thomas Huxley was born in Ealing (United Kingdom) on May 4, 1825 to George Huxley and Rachel Withers. He died in Eastbourne (United Kingdom) on June 29, 1895. Thomas was an English biologist know as "Darwin's Bulldog." (encyclopedia.com)

Thomas Huxley

1859

In 1859 Thomas Huxley declared that humans must have evolved from animals too. Thomas Huxley's contributions impacted the theory of evolution by showing, like other animals, humans also have evolved over time. (enclyclopedia.com)

Sewall Wright

12/21/1889 - 3/3/1988

Sewall Wright was born in Melrose, Massachusetts, United States to Philip and Elizabeth on December 21, 1889. He then died in Madison, Wisconsin, United States on March 3, 1988. (nndb.com)

Ronald Fisher

2/17/1890 - 7/29/1962

Ronald Fisher was born in East Finchley, London, England on February 17,1890 to George and Katie Fisher. He later died in Australia on July 29, 1962. He was an English statistician, evolutionary biologist, and geneticist. (encyclopedia.com)

Ronald Fisher

1922

Fisher considered that interactions of natural selection, random survival, assortative mating, and dominance could cause evolution. His thoughts showed that evolution could be caused by these factors. (encyclopedia.com)

Ronald Fisher

1930

Ronald Fisher published The Genetical Theory of Natural Selection. (encyclopeda.com)

Sewall Wright

1931

He proposed the shifting balance theory. The shifting balance theory impacted the theory of evolution by inspiring other theories. (nndb.com)

Stephen Gould

9/10/1941 - 5/20/2002

Stephen Gould was born in Bayside, New York, United States on September 10, 1941 to Leonard and Eleanor. He died in Manhattan, New York on May 20, 2002. Stephen was a paleontologist, evolutionary biologist, and historian of science. (Wikipedia.org)

Stephen Gould

1972

His main contribution was punctured equilibrium. The punctured equilibrium concept impacted the theory of evolution by explaining that it doe not occur at a constant rate. (Wikipedia.org)

Stephen Gould

1977

He published Ontogeny and Phylogeny. (Wikipedia.org)