Neumann’s success rested on incorruptible, logical, unsparing work ethic.

Evidence

In all of these activities he was immensely successful, an incorruptible, almost fanatical worker, an acutely logical thinker who was neither sentimental nor witty, a man determined to achieve social recognition so long as this could be accomplished without being untrue to himself. — Rolf Wiggershaus, The Frankfurt School, 921