Leonard Susskind on Richard Feynman, the Holographic Principle, and Unanswered Questions in Physics

TL;DR

Leonard Susskind describes himself as a mainstream, conservative physicist who resolves inconsistencies (conflicts of principle) rather than pursuing radical ideas. He explains the holographic principle as a now‑standard tool derived from black‑hole information paradoxes, and emphasizes that the central unresolved problem in physics is the consistent unification of quantum mechanics and gravity.

Key insights

• Susskind claims he is “extremely mainstream” and that his reputation as a radical stems from working on problems where all conventional options had failed, forcing him to try what seemed outlandish (e
• He identifies Freeman Dyson and Gerard ’t Hooft as more contrarian than himself; Richard Feynman was mainstream but had a unique scientific personality.
• His ideas almost always originate from a “conflict of principle” or paradox – a situation where pieces of theory do not fit together (e.g., quark confinement, black‑hole information loss).