Joseph Priestley. The noted English scientist, discoverer of oxygen, and Unitarian theologian lived in Northumberland, 1794 to 1804. His home and laboratory along the river are now a Priestley memorial and museum.

See also...
Spudgun67 on Wikimedia Commons
Peter Hughes on Flickr
Tim Ellis on Flickr
Open Plaques on Flickr
Cy Evans on Wikimedia Commons
Peter Hughes on Flickr
David Grimshaw on Geograph
User:Ruhrfisch on Wikimedia Commons
Seo Mise on Geograph
warrington.civsoc on Flickr PD 1.0