Daniel "Danny" M. Lewin (1969/1970(?) - September 11, 2001) was a mathematician and entrepreneur, best known for cofounding internet company Akamai Technologies.

Lewin was born in Denver, Colorado and raised in Jerusalem, Israel, where he served in Sayeret Matkal, a counter-terrorism unit of the Israel Defense Forces.

He attended the Technion university in Haifa, Israel while simultaneously working at IBM's research laboratory in Haifa. Upon finishing his undergraduate degree in 1995, he traveled to Cambridge, Massachusetts to begin graduate studies towards a PhD at the Massachusetts Institute of Technology in 1996. While there, he and his advisor, Professor F. Thomson Leighton, came up with a set of novel algorithms for efficiently delivering large amounts of internet content; these algorithms became the basis for Akamai, which the two founded in 1998.

Lewin served as the company's Chief Technical Officer (CTO) and a board member, and during the height of the internet boom, his share of Akamai stock made him nearly a billionaire (at least on paper).

While still a graduate student, he was stabbed to death aboard American Airlines Flight 11 during the September 11, 2001 terrorist attacks; he was survived by his wife and two sons.

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