Jack, the Young Explorer is the sixth in the series of seven volumes of Jack, The Young Man. Jack Danvers, a New York teen embarks on adventures that entertain, enthrall, and educate. Jack and his friend and guide travel to northern Montana to spend some time among the Blackfoot Indians. Jack learns what Indian life is like and goes on an action-packed exploration with them.

George Bird Grinnell (September 20, 1849 – April 11, 1938) was an American anthropologist, historian, naturalist, and writer. Grinnell was born in Brooklyn, New York, and graduated from Yale University with a B.A. in 1870 and a Ph.D. in 1880. Originally specializing in zoology, he became a prominent early conservationist and student of Native American life. Grinnell has been recognized for his influence on public opinion and work on legislation to preserve the American bison. Mount Grinnell is named after Grinnell.