Renormalization hasn't been a conceptual problem since Ken Wilson's work in the 1970s. Before that, it looked like a mathematical hack (rather like linear alge

Renormalization hasn't been a conceptual problem since Ken Wilson's work in the 1970s. Before that, it looked like a mathematical hack (rather like linear algebra without the geometric interpretation) and a lot of physicists who came of age in the postwar period never got over this.