William Berk­son com­plet­ed his PhD in his­to­ry and phi­los­o­phy of sci­ence under Sir Karl Pop­per at the Lon­don School of Eco­nom­ics. He is author of Fields of Force: The Devel­op­ment of a World­view from Fara­day to Ein­stein and Learn­ing from Error: Karl Popper’s Psy­chol­o­gy of Learn­ing. Since 1994 he has been the direc­tor of the Jew­ish Insti­tute for Youth and Family.