John R. (John Robbins) Mohler

Born in 1875, John R. Mohler — John Robbins Mohler — was an American veterinarian and government scientist best known for his work with the U.S. Department of Agriculture. He became a leading figure in the Bureau of Animal Industry, the federal agency responsible for studying and controlling diseases affecting livestock.

Mohler wrote and contributed to technical publications on animal disease, including work on contagious illnesses in goats and other veterinary problems of his era. He is especially remembered as a senior USDA official who helped guide national animal-health efforts during a period when veterinary science was becoming more organized and influential in the United States.

He died in 1952. While many surviving references to him are brief and professional in focus, they consistently present him as an important early veterinary administrator whose work connected laboratory knowledge, field investigation, and public service.