John L. Ridgway (1859-1947) was noted ornithologist Robert Ridgway’s younger brother. Robert encouraged John’s emerging ability as an illustrator, eventually bringing him to the Smithsonian as an assistant. The brothers collaborated on illustrations for several publications during the early 1880’s, with John assuming more of the illustration work as he gained expertise. The younger Ridgway worked for the Smithsonian only until 1884, but he continued to freelance for the Institution well into the 1890’s.
After leaving the Smithsonian, John Ridgway was employed by the United States Geological Survey where, in 1920, he established and published standard guidelines for geological illustration. In 1938, toward the end of his fifty-seven year career, Ridgway authored "Scientific Illustration," a treatise comprising the sum of his knowledge of the processes of scientific illustration. He died December 27, 1947, at the age of 88 after a long distinguished career as a scientific illustrator.