 Mehl was a fellow of the Geological Society of America (1922), the Paleontological Society, and the American Association for the Advancement of Science.In 1922, he named "Machaeroprosopus andersoni", on the basis of the holotype FMNH UC 396, partial skull.It was probably collected from the Bull Canyon Formation of the Chinle Group or Dockum Group, probably at the Bull Canyon, in the Guadalupe County of New Mexico.