Kneser excelled in several fields of mathematics, above all in algebra, geometry, mathematical physics, and analysis.
Still, more than one hundred years later, Kneser's style can be praised for a dry and strict clarity that characterises the classical beauty of those mathematical works when the author is patently a master of the subject and only knows how to describe the pure substance of the matter without any introductory or ornamental digression.
Kneser's works were not limited to mathematics though, for even during his studies he also attended lectures on history, literature and philosophy and reflected on knowledge theory.