Henry Lewis Rietz (24 August 1875, Gilmore, Ohio – 7 December 1943, Iowa City, Iowa) was an American mathematician, actuarial scientist, and statistician, who was a leader in the development of statistical theory.
[1] Rietz was a professor of mathematics and astronomy at Butler University in Indianapolis for one year, before becoming a mathematics instructor at the University of Illinois in 1903.
As instructor and then professor, he stayed at the U. of Illinois until his departure in 1918.
In addition to being a professor, Rietz worked as an actuary and consultant.
In 1935 he was a founding member of the Institute of Mathematical Statistics and became its first president, serving until 1937.