author
A mid-20th-century religious writer best known for a concise biography of Martin Luther, he wrote in a clear, accessible way for general readers. Public records identify him as Rev. Carl Edward Koppenhaver, linking his authorship with a life in Lutheran ministry.

by Carl E. Koppenhaver
Carl E. Koppenhaver is known today mainly for Martin Luther, a short popular biography that has remained available through public-domain editions and audiobook projects. The book introduces Luther's life and influence in a straightforward style, suggesting an author who wanted church history to feel approachable rather than academic.
Available records connect the author with Rev. Carl Edward Koppenhaver, who was born in Philadelphia, Pennsylvania, on February 8, 1915, and died on June 19, 2000. Those records indicate a life tied to Pennsylvania and to Lutheran ministry, which fits the religious focus of his best-known work.
Very little detailed biographical information about him is readily available online, so much of his story remains quiet in the background. Even so, his surviving work gives readers a clear sense of his aim: to present an important figure from Christian history in a brief, readable, and engaging form.