International Vegetarian Union (IVU)
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England: early 19th Century
Dr. John Snow

wikipedia: "John Snow (15 March 1813 – 16 June 1858) was an English physician and a leader in the adoption of anaesthesia and medical hygiene. He is considered to be one of the fathers of epidemiology, because of his work in tracing the source of a cholera outbreak in Soho, England, in 1854. . . . John Snow was voted in a poll of British doctors in 2003 as the greatest physician of all time."

Various sources state that Snow adopted the 'vegetable diet' at the age of 17 (in 1830) - and that this was a direct result of reading something by John Frank Newton. Some sources say he read a 'pamphlet' which is possible, though more likely he read Newton's book 'Return to Nature' published in 1811.

He had apparently already started on the temperance (anti-alcohol) route and adopted the 'distilled water' regime for life - this was based on the work of Dr. William Lambe FRCP, Newton was a patient of Lambe and promoted his methods. Dr. Lambe was still alive and well in London when Snow was there but, so far, we have no direct reports of any meeting or communication.

There is a story in the 'Life of Snow' below - which is very hostile to vegetarianism - that Snow started out using eggs and dairy products but then removed them from his diet, seemingly early on. However, that would be inconsistent with the writings of Lambe and Newton who advocated plant food only from the outset.

He died at the age of 45, and the biographer below naturally blames that on his diet... however better research has since shown that it was due to self-experimentation with anaesthetics. At least this personal knowledge, however hostile, does confirm that Snow kept to his 'vegan' diet for the rest of his life.