Career
He was a graduate of the University of Colorado. At the time of his death, Rohwer was serving as the Coordinator Defense Activities for the Agricultural Research Administration within the United States. Department of Agriculture. Rohwer worked for the United States Department of Agriculture from 1909 until his death.
Rohwer wrote Technical papers on miscellaneous forest insects.
World War II The genotypes of the sawflies or woodwasps, or the superfamily Tenthredinoidea. Technical series United States Department of Agriculture, Bureau of Entomology, Washington, District of Columbia 20: 69–109 (1911) and very many papers describing new species of Hymenoptera.
His collection is held by the Smithsonian Institution Washington Doctorate. C.