Everyone knows the name Charles Darwin, but his lesser known frenemy, Alfred Russel Wallace, was developing a lot of the same ideas around the same time.
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Sources:
https://www.britannica.com/biography/Alfred-Russel-Wallace
http://www.npr.org/templates/story/story.php?storyId=92059646
http://www.bbc.com/news/uk-wales-21549079
http://evolution.berkeley.edu/evolibrary/article/history_16
https://www.wired.com/2011/07/0701darwin-wallace-linnaean-society-london/

Images:
https://commons.wikimedia.org/wiki/File:1878_Darwin_photo_by_Leonard_from_Woodall_1884_-_cropped_grayed_partially_cleaned.jpg
https://commons.wikimedia.org/wiki/File:Charles_Darwin_by_G._Richmond.png
https://commons.wikimedia.org/wiki/File:Darwin%27s_finches_by_Gould.jpg
https://commons.wikimedia.org/wiki/File:Alfred-Russel-Wallace-c1895.jpg
https://commons.wikimedia.org/wiki/File:Voyage_of_the_Beagle-en.svg
https://commons.wikimedia.org/wiki/File:Voyage_of_the_Beagle-en.svg
https://commons.wikimedia.org/wiki/File:Wallace_map_archipelago.jpg
https://commons.wikimedia.org/wiki/File:PSM_V57_D097_Hms_beagle_in_the_straits_of_magellan.png
https://commons.wikimedia.org/wiki/File:Wallacea.png
https://commons.wikimedia.org/wiki/File:Bronze_statue_of_Alfred_Russel_Wallace.jpg