About Chester Carlson
Chester Floyd Carlson was an American physicist, inventor, and patent attorney born in Seattle, Washington. At age ten, he created a newspaper called "This and That", created by hand and circulated among his friends with a routing list. Carlson invented electrophotography (now xerography, meaning "dry writing"), producing a dry copy in contrast to the wet copies then produced by the Photostat process; it is now used by millions of photocopiers worldwide.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.