author
1871–1954
Best known for a practical guide to teaching history, this early-20th-century educator wrote for teachers in training and focused on how history could be observed, organized, and taught clearly. His surviving published work suggests a careful, method-minded approach to the classroom rather than a literary one.

by Calvin Olin Davis
Calvin Olin Davis was an American author and educator whose life dates are recorded as 1871–1954. Public-domain catalog records identify him as the author of A Guide to Methods and Observation in History, a work aimed at students and teachers studying how history should be taught.
That book, published in the early 20th century and now preserved by Project Gutenberg, centers on practical classroom method. It discusses the teaching of history through observation, source use, lesson planning, and clear thinking, which makes Davis especially interesting as a writer for readers curious about the history of education.
Reliable biographical detail about his personal life appears to be limited in the sources I could confirm here, so the picture that emerges is mostly a professional one: a teacherly writer concerned with helping others teach history well. Even from that small record, his work reflects a serious belief that history education should be thoughtful, organized, and useful.