L. Roy Terwilliger is an author about whom very little biographical information is available; the only confirmed details are his name and a single work. His representative work is Cuban Folk-Lore, which, judging from its title, falls within the field of folklore or folk literature studies and likely records and organizes Cuban folk tales, legends, songs, superstitions, or everyday customs. Because public information is limited, his nationality, dates of birth and death, education, professional identity, and academic lineage cannot be verified and should not be speculated upon. Based on the available clues, Terwilliger's writing interest centers on collecting and presenting regional folklore, a kind of work that typically has the character of a source compilation and ethnographic record and can offer reference to readers studying Caribbean culture and the blending of Spanish colonial and African traditions. Although his personal history remains obscure, this work is the only entry point for understanding his scholarly focus and holds a place among English-language documents on Cuban folklore.