Current and former Securities and Exchange Commission officials are among those scheduled to testify this week before the panel investigating the causes of the financial crisis.

SEC Inspector General H. David Kotz, former Commissioners Christopher Cox and William Donaldson, and former Trading & Markets Division Director Erik Sirri are slated to testify on SEC regulation of investment banks before the Financial Crisis Inquiry Commission. Their upcoming testimony is part of a two-day hearing May 5 & 6 on the "shadow banking system," non-bank financial institutions and markets that aren't subject to the same regulatory structure as traditional banks.

The 10-member bipartisan commission, led by former California treasurer Phil Angelides, was created last year under the Fraud Enforcement and Recovery Act to examine the causes of the financial meltdown and the causes of the collapse of major financial institutions that were bailed out by the government.

Other slated to appear before the panel include several former executives of investment bank Bear Stearns, which collapsed in March of 2008 and was rescued in a fire sale to JP Morgan Chase. Among them are former Bear Stearns president and co-chief operating officer Warren Spector, former chairman and chief executive officer James Cayne and former CEO Alan Schwartz, along with executives from GE Capital, Pimco, and State Street.

They'll be joined by former Treasury Secretary Henry Paulson and current Treasury secretary Timothy Geithner, who are set to appear before the FCIC on May 5.

At the time of Bear Stearns' collapse, no government agency had authority to regulate large investment bank holding companies. The SEC, under its Securities Exchange Act authority, determined net capital rules for the regulated broker-dealer subsidiaries of i-banks through its voluntary Consolidated Supervised Entities program, which was shut down in September 2008, when all of the i-banks that were part of the program were reconstituted within bank holding companies, subject to supervision by the Federal Reserve.

In April, the Commission issued a subpoena to ratings agency Moody's Corp. for failing to comply with a request for documents in a timely manner.

Spokesman Michael Adler said Moody's "has and continues to devote substantial resources to producing documents and making our people available to the FCIC, our regulators, State Attorneys General, Congress and many others tasked with understanding the financial crisis and the role of the rating agencies. We continue to work to provide useful and appropriate responses to these inquiries."

In a May 4 e-mail, FCIC spokesman Tucker Warren said Moody's "has begun to comply but has a long way to go before satisfying the requests of the Commission for documents and information."

Warren also confirmed that Wendy Edelberg, who was serving as a research director, has replaced Tom Greene as the commission's executive director. Greene will continue to serve as special investigative counsel working alongside the commission's investigative teams on specific projects.

"The Commission made an evaluation of where it is in its work and its focus from now until the time when we deliver our report in December," Warren said in an e-mail statement. "Wendy brings tremendous experience, expertise, and grasp of the issues the Commission is dealing with, and we will benefit from the leadership she'll bring to the position."

The FCIC's final report is due in December. Asked whether the Commission would release any interim reports or details of its findings prior to its final report to Congress, Warren said the panel's public hearings "serve as opportunities for the American people to see how our work is progressing."