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{{Infobox scientist
| name =
| birth_name = John William Watson Stephens
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| image = File:John_William_Watson_Stephens._Photograph._Wellcome_L0011420.jpg
| alt =
| caption = photo courtesy of Wellcome Trust
| birth_date = {{Birth date|df=yes|1865|03|02}}
| birth_place = [[Ferryside]], [[Carmarthenshire]], Wales
| death_date = {{Death date and age|df=yes|1946|05|17|1865|03|02}}
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| awards = [[Fellow of the Royal Society]] {{small|(1920)}}<br>[[Manson Medal]] {{small|(1935)}}
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'''John William Watson Stephens''' [[Fellow of the Royal Society|FRS]] (1865–1946) was a British parasitologist and expert on tropical diseases.<ref>{{acad|id=STFS884JW|name=Stephens, John William Watson}}</ref><ref>{{cite book|chapter=Stephens, John William Watson|chapter-url=https://babel.hathitrust.org/cgi/pt?id=uc1.b3452406;view=1up;seq=2299|title=Who's Who|year=1918|pages=2267–2268}}</ref><ref>{{cite journal|author=Christophers SR|title=Obituary. J. W. W. Stephes, MD, FRS|journal=Br Med J|date=25 May 1946|volume=1|issue=4455|page=816|doi=10.1136/bmj.1.4455.816}}</ref>

After a term at [[Christ College, Brecon]] and then completion of secondary school at [[Dulwich College]], Stephens matriculated in 1884 at [[Gonville and Caius College, Cambridge]], graduating there with B.A. in 1887. He received his medical education at [[St Bartholomew's Hospital]], receiving there M.B. and B.Chir. in 1893 and D.P.H. in 1894.

Stephens held in 1895–1886 a Sir Trevor Lawrence research studentship in pathology and bacteriology at St Bartholomew's Hospital and in 1897 a John Lucas Walker research studentship in pathology at Cambridge. He became in 1897 an Assistant Bacteriologist to the [[British Raj|Government of India]]. In 1898–1902 he was a member of the Royal Society's malaria commission in Africa and India. At [[Liverpool School of Tropical Medicine]] he was from 1903 to 1913 the Walter Myers Lecturer in Tropical Medicine and, as the successor to Sir [[Ronald Ross]], from 1913 to 1928 the Alfred Jones Professor of Tropical Medicine. In World War I he was a malaria consultant with rank of Lieutenant-Colonel, [[Royal Army Medical Corps]]. He was a member of the Colonial Medical Research Committee in 1927 and the president of the [[Royal Society of Tropical Medicine and Hygiene]] in 1927–1928.

Stephens and [[Harold Benjamin Fantham|H. B. Fantham]] did pioneering work on [[Trypanosoma brucei|sleeping sickness]] and were the first to distinguish ''Trypanosoma brucei rhodesiense'' from ''Trypanosoma brucei gambiense''<ref>{{cite journal|author=Stephens JWW|author2=Fantham HB|year=1910|title=On the peculiar morphology of a trypanosome from a case of sleeping sickness and the possibility of its being a new species (T. rhodesiense)|journal=Annals of Tropical Medicine & Parasitology|volume=4|issue=3|pages=343–350|doi=10.1080/00034983.1910.11685723|bibcode=1910RSPSB..83...28S|url=https://zenodo.org/record/1429906}}</ref> (although they called ''T. brucei gambiense'' and ''T. brucei rhodesiense'' by the names ''T. gambiense'' and ''T. rhodesiense'', respectively — contrary to contemporary taxonomy).

There are several species of the protozoan parasite [[Plasmodium#Human|''Plasmodium'']] that cause malaria in humans. One such species, namely ''[[Plasmodium ovale]]'', was first described in 1914 by Stephens in a blood sample taken from a patient in [[Pachmarhi]], [[Madhya Pradesh]] in the autumn of 1913.<ref>{{cite journal|author=Stephens JWW|date=8 April 1914|title=A new malaria parasite of man|journal=Proc R Soc Lond B|volume=87|issue=596|pages=375–377|doi=10.1098/rspb.1914.0024|bibcode=1914RSPSB..87..375S|doi-access=free}}</ref>

He married in 1901 and was the father of two sons.

He retired to Holcwm, Ferryside, Kidwelly. In 1935 he conducted archaeological excavations on the nearby hill of Allt [[Cunedda]], but made little record. He did find, somewhere on the hill, the broken head of a stone [[Axe#Hammer_axe|hammer axe]].<ref>Kidwelly History [http://www.kidwellyhistory.co.uk/Articles/AlltCunedda/AlltCunedda.htm] accessed 11 Dec 2022</ref>

==Selected works==
*with [[Rickard Christophers|S. R. Christophers]]: {{cite book|title=The practical study of malaria and other blood parasites|year=1903|url=http://catalog.hathitrust.org/Record/006599049}}
**[https://catalog.hathitrust.org/Record/002085893 French translation, published 1906 ]
*{{cite book|title=Blackwater fever: a historical survey and summary of observations made over a century|year=1937|postscript=; 727 pages}}

==References==
{{reflist}}

{{Authority control}}

{{DEFAULTSORT:Stephens, John William Watson}}
[[Category:1865 births]]
[[Category:1946 deaths]]
[[Category:People educated at Dulwich College]]
[[Category:Alumni of Gonville and Caius College, Cambridge]]
[[Category:Malariologists]]
[[Category:British parasitologists]]
[[Category:Fellows of the Royal Society]]
[[Category:Indian Medical Service officers]]
[[Category:People from Carmarthenshire]]
[[Category:Manson medal winners]]
[[Category:Presidents of the Royal Society of Tropical Medicine and Hygiene]]
[[Category:Academics of the Liverpool School of Tropical Medicine]]

John William Watson Stephens - Revision history

Bot at 12:25, 19 December 2022