This paper establishes a structural translation of financial portfolio theory into systemic social inquiry, demonstrating that the mitigation of personal crisis relies on the systematic diversification of Social Emotional Assets (SEA) to prevent catastrophic Identity Liquidation. Human Asset Portfolio Hedge Engineering (HAPHE) is introduced not as a metaphor but as a formal empirical framework that applies the mathematical mechanics of hedging, diversification and concentration risk — drawn from Modern Portfolio Theory (Markowitz, 1952) — to the domain of human social investment. The framework proposes that individuals distribute a finite psychological resource, Time (Thought + Activity) or T(T+A), across a taxonomy of ten Social Emotional Asset categories, and that the structural distribution of this resource — quantified by the Concentration Exposure Index (CEI) — is a primary and measurable determinant of systemic vulnerability at points of disruption and transition. Two preliminary evidence bodies validate the framework’s core claims across demographically distinct populations. The HAPHE Ten-Infant Observational Study established that infants with diversified comfort object portfolios exhibited an 83% reduction in distress duration upon asset removal compared to infants with single-object concentration, with no overlap between groups and consistent replacement object rejection by the concentrated group — demonstrating that portfolio concentration dynamics operate prior to language, culture or deliberate choice. This structural dynamic is replicated in the HAPHE Student Population Inquiry (n=823, three UK universities), where 40.1% of participants presented Stronghold-level CEI configurations (CEI > 0.70); Stronghold-level participants systematically underestimated their own concentration (the self-assessment gap, consistent with the happiness blindness construct); and the most prevalent misidentified concentration pattern was the social group counted as multiple independent assets but constituting a single Family-Like Group SEA (false diversification). A brief intervention pilot (n=129) demonstrated that structural portfolio awareness can be generated in under 90 seconds in naturalistic settings, shifting self-identification as concentrated from 0% to over 80% post-intervention. The paper introduces the complete HAPHE proprietary lexicon; the investment mechanism including opportunity cost dynamics and periodic self-audit; the concept of differential asset volatility and the Risk-Adjusted CEI; the HAPHE Audit and its three deployment contexts; six institutional population domains with established prior theoretical claims; and a formal empirical programme for validation. University and institutional research partnerships are invited under formal data sharing and intellectual property agreements. Keywords: Human Asset Portfolio Hedge Engineering; HAPHE; Social Emotional Assets; SEA; Concentration Exposure Index; CEI; T(T+A); HAPHE Audit; identity liquidation; asset rupture; happiness blindness; portfolio diversification; systemic resilience; Modern Portfolio Theory; social inquiry; prevention; upstream intervention; leaving care; criminal justice; military transition; mental health; university retention; schools; applied anthropology; family-like group; false diversification; interdisciplinary