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George Peckham was born in Albany, New York. At age 18, he enlisted in the U.S. Army to fight in the American Civil War, reaching the rank of first lieutenant. After the war, he resumed his studies, obtaining a law degree from Albany Law School in 1867.[1] After graduation, George worked at the law office of James T. Brown of Milwaukee.[1] Not caring for the law, however, he became a student in the medical college of the University of Michigan, earning his M.D. in 1872.[1] Rather than practice medicine, however, he chose to teach biology at East Division High School of Milwaukee, Wisconsin. In 1880 he organized the first American biological laboratory program in any high school. He married his colleague, Elizabeth Maria Gifford, one of the first science graduates from Vassar. In 1888, Peckham became principal of East Division, and in 1891, an inspector for the Wisconsin Department of Public Instruction. He also served during this period as President of the Wisconsin Academy of Sciences, Arts and Letters.[2] In 1897, he became the director of the Milwaukee Public Library, in which position he served until retirement in 1910. He died on January 10, 1914, at the age of 68.[3][4]

Elizabeth Maria Gifford (later Peckham) was born in Milwaukee, Wisconsin in 1854. She graduated from Vassar College in 1876. She was active in the women's suffrage movement both at the state and national level and testified before legislative committees on several occasions. She served as one of the first librarians in the city of Milwaukee. Elizabeth Peckham died of pneumonia on February 11, 1940, at the age of 85.[4]

Together, they introduced Darwinian concepts into secondary education and began their studies on the taxonomy and behavior of jumping spiders (Salticidae), a large group of visually oriented spiders. They were among the earliest taxonomists to emphasize the value of behavior in classification. In 1889-1890 they published Observations on Sexual Selection in Spiders of the Family Attidae, and Additional Observations on Sexual Selection in Spiders of the Family Attidæ, with Some Remarks on Mr. Wallace's Theory of Sexual Ornamentation, among the first studies on sexual selection, supporting Darwin's concept against Wallace's alternative explanation of courtship behavior. In 1898 they produced On the Instincts and Habits of the Solitary Wasps, a work considered a scientific classic for its style as well as its scholarship. Unlike the later work of Fabre, which praised the supposed "perfection" of insect behavior, the Peckhams identified series of behaviors which were subject to natural selection.

The Peckhams were lifetime collaborators, as researchers and educators. From 1883 to 1909 they described 63 genera and 366 species. The North American Peckham Society is named after them. It is dedicated to salticid research; its irregular publication is titled Peckhamia.[5]

In addition to the various taxa named after them, in 1929, Milwaukee Public Schools built a new junior high school which was named Peckham Junior High School. The name was changed in the early 1970s to honor Jackie Robinson. It was shut down in 2005, and converted to apartments in 2011–2012 with the help of historic preservation tax credits.[6]