Brief biographical sketches of six federal prosecutors under investigation for mishandling the trial of former Sen. Ted Stevens.

BRENDA MORRIS: A longtime prosecutor with the Justice Department's Public Integrity Section, Morris now serves as its principal deputy. She helped supervise the investigation into disgraced lobbyist Jack Abramoff and has prosecuted corruption cases around the country. She teaches corruption investigations within the Justice Department and is a professor at Georgetown Law School. A graduate of Howard University law school, she served as the lead attorney in the Stevens trial, giving the government's opening statement and cross-examining Stevens.

NICHOLAS MARSH: One of two Public Integrity trial attorneys on the case, Marsh handled much of the courtroom work during the trials of Alaska lawmakers caught up in the scandal. He has been part of numerous other public corruption investigations, including a scheme in Mississippi to defraud a $400 million fen-phen settlement. An FBI whistleblower accused Marsh of intentionally withholding evidence from Stevens and sending a witness back to Alaska during trial to prevent potentially damaging testimony. The prosecution team denies those accusations.

JOSEPH BOTTINI: An assistant U.S. attorney in Alaska, Bottini was a key figure in the Stevens case. He questioned the government's star witness, Bill Allen, and delivered the second half of the government's closing argument. Much of Allen's testimony had been discredited. The contempt investigation will look into whether prosecutors knew there was evidence of inconsistencies in Allen's statements but concealed it. Bottini graduated from California Western School of Law.

WILLIAM WELCH: The chief of the Public Integrity section, Welch supervised the Stevens case but did not participate in the trial. He has supervised every major public corruption case brought by the department in the last several years. A former prosecutor in Springfield, Mass., Welch prosecuted former veterans hospital nurse Kristen Gilbert for killing four patients by injecting them with a heart stimulant. A graduate of Northwestern University Law School, Welch has been mentioned as a possible candidate for the U.S. attorney job in Massachusetts.

EDWARD SULLIVAN: The other Public Integrity trial attorney in the case, Sullivan has been part of the trial team that won convictions of several Alaska lawmakers caught up in the corruption scandal. But he played a mostly behind-the-scenes role in the Stevens trial and his role in any mishandling of evidence is unclear.