Bloomberg's wealth is estimated at more than $11 billion, a fortune he built after founding the financial information empire that bears his name. He stepped down from the company to run for mayor in 2001, but retains a 68 percent stake in the company.
The 66-year-old mayor, who is in his second term, had been considering an independent run for president this year but said recently he had decided not to make a bid for the White House. The lifelong Democrat changed parties for his first mayoral run but last year abandoned party politics and became an independent.
Bloomberg does not get an advance for the book and is donating all royalties to the World Trade Center memorial foundation.