Jack Welch led a two-decade transformation of GE through restructuring, cultural changes, and strategic initiatives. When he became CEO in 1981, GE faced challenges from economic recession and inefficient operations. Welch restructured GE by divesting 200+ businesses, making 370+ acquisitions, and eliminating over 200,000 jobs. He introduced initiatives like Six Sigma to improve quality and services businesses to diversify revenues. By pursuing boundaryless operations and developing leaders, Welch transformed GE's culture. Through three waves of changes from 1981-2001, he helped GE become the most profitable and diversified company.