John Edward Wansbrough was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 historian who taught at the University of London

University of London

-20th century:Shortly after 6 Burlington Gardens was vacated, the University went through a period of rapid expansion. Bedford College, Royal Holloway and the London School of Economics all joined in 1900, Regent's Park College, which had affiliated in 1841 became an official divinity school of the...

's School of Oriental and African Studies

School of Oriental and African Studies

The School of Oriental and African Studies is a public research university located in London, United Kingdom and a constituent college of the University of London...

 (SOAS). Wansbrough's emphasis was on the critique of traditional accounts of the origins of Islam. Born in Peoria, Illinois

Peoria, Illinois

Peoria is the largest city on the Illinois River and the county seat of Peoria County, Illinois, in the United States. It is named after the Peoria tribe. As of the 2010 census, the city was the seventh-most populated in Illinois, with a population of 115,007, and is the third-most populated...

, Wansbrough completed his studies at Harvard University

Harvard University

Harvard University is a private Ivy League university located in Cambridge, Massachusetts, United States, established in 1636 by the Massachusetts legislature. Harvard is the oldest institution of higher learning in the United States and the first corporation chartered in the country...

, and spent the rest of his academic career at SOAS.

He caused a furor in the 1970s when his research on early Islamic manuscripts, including the analysis of the repeated use of monotheistic

Monotheism

Monotheism is the belief in the existence of one and only one god. Monotheism is characteristic of the Baha'i Faith, Christianity, Druzism, Hinduism, Islam, Judaism, Samaritanism, Sikhism and Zoroastrianism.While they profess the existence of only one deity, monotheistic religions may still...

 Judeo-Christian

Judeo-Christian

Judeo-Christian is a term used in the United States since the 1940s to refer to standards of ethics said to be held in common by Judaism and Christianity, for example the Ten Commandments...

 imagery found in the Qur'an

Qur'an

The Quran , also transliterated Qur'an, Koran, Alcoran, Qur’ān, Coran, Kuran, and al-Qur’ān, is the central religious text of Islam, which Muslims consider the verbatim word of God . It is regarded widely as the finest piece of literature in the Arabic language...

 led him to posit that the rise of Islam

Islam

Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

 was a mutation of what was originally a Judeo-Christian sect trying to spread in Arab

Arab

Arab people, also known as Arabs , are a panethnicity primarily living in the Arab world, which is located in Western Asia and North Africa. They are identified as such on one or more of genealogical, linguistic, or cultural grounds, with tribal affiliations, and intra-tribal relationships playing...

 lands, rather than by simple cultural diffusion

Cultural diffusion

In cultural anthropology and cultural geography, cultural diffusion, as first conceptualized by Alfred L. Kroeber in his influential 1940 paper Stimulus Diffusion, or trans-cultural diffusion in later reformulations, is the spread of cultural items—such as ideas, styles, religions, technologies,...

.