author
1871–1944
A Danish physicist who turned science into lively, readable books for a broad audience, he helped bring modern ideas in technology and physics to everyday readers. His career moved between teaching, editing, librarianship, and writing, with popular science at the center of it all.

by Helge Holst, Hendrik Anthony Kramers
Born in Ærøskøbing on July 4, 1871, and later dying in Gentofte on November 28, 1944, he trained in physics and earned his cand.mag. in 1893. Early in his career he worked as an assistant at the Polytechnic school in Copenhagen and also helped with physics experiments, but illness forced him to give up some of his teaching work.
After recovering, he built a wide-ranging career as a writer, editor, and librarian. Danish biographical sources describe him as a physicist, author, and librarian, and note that he co-edited the general-interest magazine Frem. He also played a major role in the later edition of Opfindelsernes Bog, a major work on inventions and technology that was said to be shaped largely by his contribution.
He is especially remembered for making science accessible. His books and essays introduced readers to subjects such as invention, flight, atom theory, and the changing scientific picture of the world, helping connect specialist knowledge with ordinary curiosity in a warm, explanatory way.