9. Bill Gates
Bill Gates has singularly amassed the largest nominal fortune in all of history through his computer technology corporation Microsoft, peaking at US$101 billion in 1999. By 2007, his net worth had dropped to US$82 billion, and by 2013 his worth was valued at US$67 billion. Extensive donation to charity is the primary cause of his decrease in wealth. In terms of real value, Gates is likely one of the ten wealthiest Americans in history. He has been placed in the top 10 wealthiest people of all time.