I'm certain they have inside and outside financial consultants. Lawyers would not know enough to control and invest the vast sums floating around. Part of me doubts it is GB members themselves. Isn't it lovely to devote your life to a religion and the most basic things are unknown. Even the Vatican Bank has more transparency. I also believe that if you researched other religions, you would quickly find their financial officer. Perhaps I am wrong.
The power behind the throne. As a side note, every church where I've worshipped posted the montly financial statement. The financial committee was always open to anyone who wanted to listen or play an active role.
I would love to see a list of their stock and bond holdings. The GB members do not have the knowledge to deal with this amount of money.