Well according to this report:
There are two approaches to being a consultant. One is to get into it when you are young just out of a B School. The other is to build intense expertise over your subject all your life, make a huge dent in the universe and then watch others ask you for expertise. Rudolph Guiliani is also another example.
Former Federal Reserve chairman Alan Greenspan, whose economic outlook continues to rattle world markets, has inked a consulting deal with Pacific Investment Management Co., the bond management giant.Mr. Greenspan will meet with executives at the Newport Beach, Calif.-based company once each quarter to discuss trends and Federal Reserve policy, according to published reports.
Mr. Greenspan will speak with Pimco executives as often as twice a week via conference call and e-mail.
He will also discuss Federal Reserve interest-rate policy with the firm, with the proviso that those conversations are kept private, according to a Wall Street Journal report.