E347: The $26B CIO Who Turned Superforecasting Into Alpha

Superforecasting methodology serves as the foundational framework for managing the $26 billion Arizona PSPRS portfolio, shifting investment decisions from subjective intuition to rigorous probabilistic calibration. Mark Steed, the Chief Investment Officer, utilizes Breyer scores and "base rate" analysis to quantify confidence levels and track decision-making accuracy over time. This quantitative approach mitigates overconfidence, fosters intellectual humility, and transforms the culture of disagreement into a collaborative effort to bridge gaps in logic. By simplifying the portfolio into broad categories like capital appreciation and contractual income, the organization increases competition for capital and avoids the rigid constraints of traditional asset class silos. This first-principles logic extends to manager selection, where GPs are held accountable to specific success definitions and scrutinized for miscalibration. Ultimately, prioritizing what is unknown over performative certainty allows the team to achieve superior risk-adjusted returns while maintaining transparency for the first responders they serve.