author
Little is firmly documented about this Dutch-language author, but the surviving work linked to the name offers a clear, accessible introduction to Rembrandt for students and general readers. The book has endured through Project Gutenberg and modern reprints, suggesting a practical educational appeal that outlived its original classroom setting.

by G. Kielder
G. Kielder is credited as the author of Meesterstukken van Rembrandt Harmensz. van Rijn, a Dutch educational work centered on Rembrandt and intended for school use. The text is available through Project Gutenberg, where it is listed under Kielder's name, and later editions and library listings continue to attribute the book to the same author.
Reliable biographical details about Kielder appear to be scarce online. Based on the surviving book and its subtitles, Kielder seems to have written in a straightforward, instructive style aimed at helping younger readers and students engage with Dutch art and one of its most famous painters.
Because so little personal information could be confirmed from dependable sources during this search, it is best to view G. Kielder as a little-known educational writer whose legacy rests mainly on this concise introduction to Rembrandt's work.