His father was a musical director, and his mother the daughter of a physician.
He attended Amherst College in Massachusetts, graduating with an A.B.
in 1886.
He then taught high school biology in Chicago for three years before attending the University of Freiburg in Germany.
He studied under anatomist Robert Wiedersheim, and earned a Ph.D.
in 1891.
He joined the Smith College faculty in 1892, where he spent the remainder of his career.
On July 26, 1906, he married Inez L.
Whipple, a Smith College instructor and former research assistant.
Wilder's published work include seven books and 39 journal articles.
He was a member of the American Society of Naturalists, American Society of Zoologists, Association of American Anatomists, American Anthropological Association, American Academy of Arts and Sciences, International Association for Identification, and the Boston Society of Natural History.