Forbes estimated his wealth to be $4.1 billion in 2012.

Forbes magazine has estimated his personal wealth at $500 million.

Dutch magazine Quote has estimated the family's total wealth to be about €209 million.

Dutch magazine Quote has estimated the family's total wealth to be about €9.2 billion.

The Rich 200 list estimated his personal wealth at around A$160,000,000.

Forbes estimated his net wealth at $8.3 billion in 2010, making him the 42nd-wealthiest American.

Forbes magazine estimated his wealth at $750 million, making him one of the nation's 400 richest people.

In 1990, Forbes magazine estimated her wealth at $700 million.

The editors estimate subjects' wealth from a range of public information, based on values at January each year.

Price estimates his personal wealth at $250 million to $300 million.