Warren Ewens, FRS, is an Australian-born professor of biology at the University of Pennsylvania. He concentrates his research on the mathematical, statistical and theoretical aspects of population genetics. Ewens has worked in human population genetics, computational biology, and evolutionary population genetics. He introduced the Ewens's sampling formula.

Ewens received a B.A. from the University of Melbourne, and a Ph.D. from the Australian National University in 1962. He joined the department of biology at the University of Pennsylvania in 1972 and in 2006 was named the Christopher H. Browne Distinguished Professor of Biology.

Dr. Ewens is a member of the Royal Society and the Australian Academy of Science. He is also the recipient of the Australian Statistical Society Pitman Medal and Oxford University's Weldon Memorial Prize. His teaching and mentoring at the University of Pennsylvania have also been recognized by awards.

Further reading

• Ewens W.J. (1972). "The sampling theory of selectively neutral alleles". Theoretical Population Biology 3: 87-112.
• Ewens W.J. (2004). Mathematical Population Genetics (2nd Edition). Springer-Verlag, New York. ISBN 0-387-20191-2.