Welch and Immelt led GE with different styles. [1] Welch joined GE in 1960 and became CEO in 1981, focusing on acquisitions and innovations to drive profits. [2] He instituted a performance review system that fired bottom performers and generously rewarded top ones. [3] Immelt became CEO in 2001 facing challenges from 9/11, but restructured GE's portfolio and increased transparency and innovation.