In additon to writing many texts on mathematics and astronomy, I am remembered most for writing The Grounde of Artes, the first arithmetic text printed in the English language.
I studied and taught mathematics at both Cambridge and Oxford.
I also was a Cambridge physician and cared for Edward IV and Mary Tudor.
In my texts, I popularized the use of + and - signs, and with the following sentence introduced the equal sign into print: I will sette as I doe often in woorke use, a paire of paralles, or Gemowe (twin) lines of one lengthe, thus: ==, bicause noe 2 thynges can be moare equalle.
Perhaps the only English mathematician of any stature in the Sixteenth century, I popularized the use of abaci and algorithms to do mathematics.
Robert Recorde (1510-1558)