Peter Albert Loeb (born July 3, 1937) is a mathematician at the University of Illinois at Urbana–Champaign. He co-authored a basic reference text on nonstandard analysis (Hurd–Loeb 1985). Reviewer Perry Smith for MathSciNet wrote:
The notion of Loeb measure named after him has become a standard tool in the field.[2]
In 2012 he became a fellow of the American Mathematical Society.[3]