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Jeffrey Lang (born in1954) is an American mathematician and Muslim writer.

Biography
Lang was born into a very Catholic family in Bridgeport in Connecticut. Although attended a Catholic school, Jeffrey was an atheist. But in the early 1980s, he converted to Islam. He married a Saudi woman.

He received his MS and PhD from Purdue University, and is a professor in the Department of Mathematics at the University of Kansas. Mathematician, Jeffrey Lang has also written numerous articles and three books on Islam which are bestsellers in the United States. One of his most important books is Even Angels ask: a Journey to Islam in America.