It's a simple social-media hashtag: #IWorkForGM. Although not started by GM CEO Mary Barra, the hashtag's statement of passion and pride is a testament to the cultural change that our choice for Industry Leader of the Year has led within the organization since being appointed to the top job nearly five years ago. Other honorees include an executive who has helped bring Lincoln back from the brink and the man chosen to follow a legend at Fiat Chrysler.