Menso Folkerts

Dr. Menso Folkerts of the Institut für Geschichte der Naturwissenschaften of the University of München (Munich, Germany).

Exert taken from: http://www.math.ubc.ca/~cass/Euclid/folkerts/folkerts.html

Image taken from: http://gausschildren.org/genwiki/index.php?title=Person:FOLKERTS,_Menso