Former Treasury Secretary Tim Geithner's departure from government six months ago apparently is treating him very well financially.

He received as much as $400,000 for three recent speeches, knowledgeable sources tell the Financial Times.

That places Geithner at the top of the fee scale for event speakers, grouping him with luminaries such as President Bill Clinton and former U.K. Prime Minister Tony Blair.

Editor's Note: Economist Unapologetically Calls Out Bernanke, Obama for Mishandling Economy. See What They Did

In his talks, Geithner discussed issues such as Federal Reserve policy and the state of the world, according to the Times.

Geithner garnered $200,000 for a speech last month at a Deutsche Bank conference, where former French President Nicolas Sarkozy and former Italian Prime Minister Mario Monti also spoke, the paper's sources say.

Geithner also appeared at the annual meetings of two major private equity firms — Blackstone in April and Warburg Pincus in May. He received no more than $100,000 for each of those gigs, according to the sources.

Clinton charges as much as $200,000 per lecture. A week after departing as Fed chairman in 2006, Alan Greenspan snagged $250,000 for speaking to hedge fund clients of now-defunct Lehman Brothers.

Meanwhile, Greenspan's predecessor Paul Volcker has made his presence felt in the public policy arena.

The Volcker rule that is part of the Dodd-Frank financial reform law is named after him. The rule restricts banks' proprietary trading and their hedge fund and private equity activity.

Editor's Note: Economist Unapologetically Calls Out Bernanke, Obama for Mishandling Economy. See What They Did