The document summarizes IBM's leadership and changes under three CEOs from the early 1990s to present:
1) Louis Gerstner transformed IBM's organizational structure in the 1990s from mechanistic to organic and customer-centric, removed bureaucracy, centralized product development, and focused on market trends over internal rules.
2) Under Sam Palmisano from 2004-2011, IBM decentralized power and had thousands of leaders work collaboratively globally. ValuesJam encouraged independent thought among employees.
3) Virginia Rometty since 2011 has enhanced growth markets, bolstered services, and outsourced jobs to India, while acquiring Green Hat for $20 billion with no change in strategy.