Ludwig's Wild Amazon Kingdom

ENTREPRENEURS

In their twilight years, some very rich men are content to devote their energies to such sedentary tasks as clipping coupons and collecting Chinese snuff bottles. Not Daniel K. Ludwig. At 79, he is a veteran of seven decades of business; he started at the age of nine by scraping together $25 to buy a sunken boat. Now a restless recluse with a fortune worth perhaps as much as $3 billion, Ludwig continues to expand his shipping-based business colossus into new areas. Besides his National Bulk...