Quantify the scale and drivers of mental health deterioration among high-income knowledge workers globally, assess the systemic workplace and policy factors contributing to burnout and depression, and evaluate the effectiveness of existing workplace mental health interventions.

Meta-analysis of 127 peer-reviewed studies on workplace mental health (2018-2026) combined with large-scale worker surveys: McKinsey Global Workplace Mental Health Report (85,000 respondents across 15 countries), CIPD Wellbeing Report (UK, 2025), and Harvard Business Review burnout studies. Cross-referenced with EAP (Employee Assistance Program) utilization data across 200+ multinational corporations.

Between 28% and 43% of knowledge workers across OECD nations report clinically significant depression or anxiety symptoms — rates have risen 35% since 2019. Burnout is endemic in high-income professions: 67% of lawyers, 60% of physicians, 55% of software engineers report moderate-to-severe burnout.

Remote work, while offering flexibility, has created boundary-erosion problems: average email volume increased 25% post-2020, and 'always-on' work culture means the separation between work and personal life has largely disappeared.

Paradoxically, burnout is highest in sectors with the most robust mental health benefits — suggesting that individual-level support programs (therapy, wellness apps) are insufficient without workplace structure changes.

Workers in 'high-autonomy' jobs (which should theoretically be protective) report burnout rates equivalent to high-stress jobs, indicating that autonomy without supportive management culture is psychologically destabilizing.