In 1878, Kingsley moved to
Providence, Rhode Island, to work as an assistant on the newly formed
United States Entomological Commission. The following year he attended the
Philadelphia Academy of Natural Science, where he studied general morphology. During this time he supported himself by drawing scientific illustrations and writing articles for various scientific journals. Kingsley then attended
Princeton University, receiving his
Doctorate of Science in 1885. In 1887 he was named Professor of Zoology at the
University of Indiana and two years later accepted the chair of Biology at the
University of Nebraska. He resigned in 1891 to take a year off to study in Europe, primarily at the
University of Freiburg under Dr.
Robert Wiedersheim. Upon his return in 1892, Kingsley was offered the chair of Biology at
Tufts College where he would write nearly all the biological articles for ''
Johnson's Universal Cyclopaedia''. From 1913 to 1921, Kingsley served as a professor of zoology at the
University of Illinois. In 1898, he founded
MDI Biological Laboratory Throughout his career, Kingsley would author over 300 scientific articles and numerous books on such subjects as vertebrae zoology, comparative zoology, and the anatomy of vertebrates. In 1902, he translated
German zoologist Richard Hertwig’s ein Handbuch der Zoologie. Kingsley was a one-time editor of the publications
Standard Natural History (1884), and
The American Naturalist (1886–96). and the American Morphological Society at
Johns Hopkins University, and held memberships in several other scientific organizations both nationally and internationally. ==Marriage==