[1] The mayfly experts Janice G. Peters and Michael D. Hubbard described him as "the greatest of living North American researchers on Ephemeroptera".
[1] W. P. McCafferty, making the dedicatory address at that conference, called him "the first biogeographer of Ephemeroptera", and listed 114 of his publications on mayflies.
Ten species and two genera (Edmundsius and Edmundsula) of mayfly are named after him, along with a beetle, a cranefly, and a stonefly.
[2] His book on the mayflies of North and Central America[6] has been described as "the benchmark upon which all subsequent taxonomic research in the area is measured.
[2] His study[7] of the subimago of the mayfly has been described as "monumental, demonstrating his acute ability to synthesize his observations and knowledge of systematics, phylogeny, morphology, paleontology, developmental biology, behaviour and ecology into unified explanatory theories".