With a $40M - $200M estimated net worth and taking Sequoia's 30 year fund IRR of ~ 12%. Let's assume he started with $40M and inherited it in 1970 (45 years ag

With a $40M - $200M estimated net worth and taking Sequoia's 30 year fund IRR of ~ 12%. Let's assume he started with $40M and inherited it in 1970 (45 years ago). If he dumped it into a 12% IRR Mutual Fund his net worth would be: (1.12)^45 * $40,000,000 = $6.6B which is greater than his $4B net worth. This of course is presumptuous at a lot of levels, but the math does make sense.