Comey frequently testifies before all three.
Although she frequently testifies to Congress, her appearances are always careful and self-possessed.
Since leaving the department, he has frequently testified before Congress about national security legal policy issues.
Bieniek frequently testified at trials, and someone had taught him the technique of looking at the jury when he answered questions.
Harry Wu, the éminence grise of Chinese dissidents, who spent 19 years in labor camps, frequently testifies before Congress about prison conditions in China.
He had dozens of meetings on Capitol Hill, frequently testifying before Congress, and also meeting with the president or his staff.
"It's terribly important to direct us to look at the neck," said Waney Squier, a pediatric neuropathologist in Britain who frequently testifies for the defense in shaken baby cases.
Mr. Masters, a hedge fund manager who has frequently testified before Congress, said in an e-mail message Thursday that he was "delving into the numbers" in the new C.F.T.C. report "to understand what they do and do not encompass".
Since late 2005, Mr. Bradbury has become a linchpin of the administration's defense of counterterrorism programs, helping to negotiate the Military Commissions Act last year and frequently testifying about the N.S.A. surveillance program.
But the prosecution's expert witness, William B. Barr, a psychologist who frequently testifies for prosecutors, concluded that Mr. Seabra was not psychotic at the time of the killing and expressed doubt that Mr. Seabra believed he was on a mission from God.
A former director at the Commodity Futures Trading Commission, Greenberger frequently testifies in Congress about financial reform.
