American businessman who served as leader and chairman of Citigroup. He received his rules degree in the School of Southern California and started his profession by functioning as a lawyer for the U.S. Metal Company in 1975. He resigned as CEO of Citigroup in November of 2007 throughout a period when the home loan industry is at severe drop. He wedded Margaret Wolff in 2003. His business Citigroup held a summary of the world’s wealthiest individuals who included Australian business owner Gina Rinehart.