Lou Gerstner, a former IBM CEO and chairman credited with turning the company around, died at 83; IBM's market value rose from $29B to ~$168B during his tenure (Patrick Oster/Bloomberg)

Patrick Oster / Bloomberg:
Lou Gerstner, a former IBM CEO and chairman credited with turning the company around, died at 83; IBM's market value rose from $29B to ~$168B during his tenure  —  Louis Gerstner, who took over International Business Machines Corp. when it was on its deathbed and resuscitated it as a technology industry leader, died Saturday.