W. Crispin (William Crispin) Sheppard

Published under the name W. Crispin Sheppard, he wrote boys' adventure fiction in the early 1900s, especially the Rambler Club series. Library and public-domain catalog records connect that pen name with William Henry Crispin Sheppard, born in 1871.

His books follow groups of young friends through camping trips, boating journeys, mountain travel, motor-car outings, and other outdoor adventures. Titles associated with him include The Rambler Club Afloat, The Rambler Club's Winter Camp, The Rambler Club in the Mountains, and The Rambler Club's Motor Car.

Reliable biographical detail beyond his name and birth year is limited in the sources I could confirm here, so this profile keeps to the basics. What does come through clearly is the kind of fiction he wrote: brisk, wholesome adventure stories built around friendship, action, and the excitement of exploring the wider world.