I have compiled a (very) short list of some of the important Welsh scientists and mathematicians throughout history. They are in no particular order. |

**Alfred Russel Wallace**

Born 8 January 1823, Usk, Monmouthshire, Wales.

Died 7 November 1913 (aged 90) Broadstone, Dorset, England.

He independently conceived the theory of evolution through natural selection, which prompted Charles Darwin to publish his own ideas in *On the Origin of Species*.

**Brian David Josephson**

Born 4 January 1940 Cardiff, Wales.

He is known as a pioneer of the theoretical undesrstanding of superconductivity. He was awarded 1/2 share of the 1973 Nobel Prize for Physics for “his theoretical predictions of the properties of a supercurrent through a tunnel barrier, in particular those phenomena which are generally known as the Josephson effects”.

**William Jones**

Born 1675, Llanfihangel Tre’r Beirdd, Isle of Anglesey

Died 3 July 1749

He proposed the use of the symbol π (the Greek letter pi) to represent the ratio of the circumference of a circle to its diameter.

**Robert Recorde**

Born ca. 1512, Tenby, Pembrokeshire, Wales

Died 1558 London, England

He introduced the “equals” sign (=) and also the “plus” sign(+) in 1557.

**Elmer Gethin Rees**

Born 1941 Llandybie, Carmarthenshire, Wales

A mathematician who has published in a diverse range of areas including topology, differential geometry, algebraic geometry, linear algebra and Morse theory.

**Lyndon Evans**

Born 1945 Aberdare Wales

Project leader of CERN’s Large Hadron Collider.

**Bertrand Arthur William Russell**

Born 18 May 1872 Trellech, Monmouthshire, UK

Died 2 February 1970 (aged 97) Penrhyndeudraeth, Wales, UK

He co-authored, with A. N. Whitehead, *Principia Mathematica*, which was an attempt to set all mathematics on the basis of logic.