The head of Masters Capital Management blew the whistle on oil speculators last year when he testified before Congress regarding the rapid run-up in oil prices as it reached its record high of $145 a barrel. Now he's testifying before the CFTC in favor of regulation.

Brian Singer could be one of the most powerful asset managers you've never heard of.

Hedge funds posted their best monthly performance in a decade in May, taking advantage of rallying stock markets and distressed opportunities across the board, according to the latest numbers from the Absolute Return Composite of hedge fund indices.

One year after urging regulators to guide Lehman Brothers toward a recapitalization and recognition of its losses, hedge fund manager David Einhorn is making more potentially prescient speeches—this time about ratings agencies and gold.