**Keith Briggs** is a mathematician notable for several world-record achievements in the field of computational mathematics:

The most accurate calculation of the Feigenbaum constants, which was published in *A precise calculation of the Feigenbaum constants*, Mathematics of Computation 57, 435-439.
The worst known badly approximable irrational pair (*Some explicit badly approximable pairs*, Journal of Number Theory, 103, 71).
The simplest known universal differential equation (Another universal differential equation).
The largest number of contributions in the last 5 years to Sloane's On-Line Encyclopedia of Integer Sequences (search for briggs in OEIS). Many of these have involved major computations, such as the number of unlabelled graphs on up to 140 nodes.
The computation of the longest sequences of colossally abundant and superabundant numbers, and their application to a test of the Riemann Hypothesis (Experimental Mathematics 15, 251-6).
An article about him was in i-squared Magazine, Issue 6 (Winter 2008/9).

He also studies the etymology of place-names.