He was most famously known for his work on mathematical statistics.
He was a major influence in the development of mathematical statistics as an academic discipline.
While working he introduced an innovative take on mathematical statistics.
Most of the numbers used by players and fans are not true mathematical statistics, but the term is in common usage.
Most of his research was devoted to probability theory and mathematical statistics.
In 1953, he became a professor of mathematical statistics at Columbia University.
He worked in foundations of mathematics, real analysis, probability theory, and mathematical statistics.
The related field of mathematical statistics develops statistical theory with mathematics.
His main fields were probability, mathematical statistics, and asymptotic theory.
He is the chair of mathematical statistics at Leiden University.