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Case file

Mark R. Cohen

Wikipedia's first sentence called it “professor of near eastern studies at princeton university”. Today it says “american scholar of jewish history in the muslim world”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2020 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2020

Cohen (born March 11, 1943) is an American scholar of Jewish history in the Muslim world. He is a leading scholar of the history of Jews in the Middle Ages under Islam .1 His research relies greatly on documents from the Cairo Geniza . From 1985 until his retirement in 2013 Cohen also led the Geniza Lab at Princeton University, which aims to make the Geniza corpus available and searchable online (as of 2013, the database contained 4,320 documents). The project is headquartered at the S.D.2 Goitein Geniza Research Lab, where many of Goitein's personal books and notes are stored.3 In 2014 Cohen was a visiting professor at New York University Abu Dhabi . Cohen won the 1981 National Jewish Book Award in the Jewish History category for his book Jewish Self-Government in Medieval Egypt. He was awarded a Guggenheim Fellowship in 1996. Cohen earned his undergraduate degree at Brandeis University , his master's degree at Columbia University , and his doctorate at the Jewish Theological Seminary .4 Cohen's Princeton University Faculty Page "Cohen is one of the most important scholars of his generation in the study of the history of Jews in the Islamic world." Jews, Christians and Muslims in Medieval and Early Modern Times: A Festschrift in Honor of Mark R.5

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 953248678.
Today
Wikipedia's first sentence called it “professor of near eastern studies at princeton university”. Today it says “american scholar of jewish history in the muslim world”. Read the current article and compare.
201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2010, and today's defining sentence is their current revision.

Then

professor of near eastern studies at princeton university

Now

american scholar of jewish history in the muslim world

Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

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