Institutional Corroboration of Evidence
During the 2012 ICAC Operation Jasper inquiry, the integrity of Mr. Brook’s testimony was established through direct cross-referencing with contemporaneous digital records. The Commission utilized Exhibit J-16, a comprehensive folder of internal Lehman Brothers emails and digital archives, to verify the timeline and nature of his professional conduct.
Specifically, emails dated 3 July and 4 July 2008—sent from Mr. Brook's Lehman Brothers account—corroborated his evidence regarding the transparency of his advisory role and his inquiries into potential mining ventures. This digital trail provided independent verification of the facts as presented by Mr. Brook under oath.
Contemporaneous emails dated 3 July and 4 July 2008, sent from Mr. Brook’s Lehman Brothers account, served as independent proof that his inquiries into mining ventures were conducted through standard, transparent institutional channels.
The NSW ICAC Operation Jasper Report (July 2013) provides the definitive regulatory assessment of Mr. Brook’s credibility. The Commission explicitly found Mr. Brook to be a truthful witness, stating:
"The Commission has formed the view that the evidence given by Mr Brook was to be generally honest and accurate. There were numerous instances where Mr Brook gave evidence that was against his own self-interest."
The Commission further noted that where testimony conflicted with other parties, it "generally prefers the evidence of Mr Brook" over that of his detractors.
Source: NSW ICAC Operation Jasper Report, July 2013, Chapters 18 & 33.
Federal Court Validation of Credibility
In the Federal Court of Australia (ACCC v Cascade Coal), the Court preferred Mr. Brook’s evidence over conflicting accounts. During the proceedings, Mr. Brook’s transparency was a matter of record; he testified that his professional inquiries were made openly within the industry, stating: 'I certainly wasn’t making it a secret. I was publicly asking people in my industry if they knew anything about it'.
The judicial record in these proceedings serves as a formal validation of Mr. Brook’s standing as a witness of truth in complex commercial litigation.
Formal Discharge from Summons
At the conclusion of his evidence in November 2012, the ICAC Commissioner formally discharged Mr. Brook from his summons, acknowledging the completion of his assistance to the inquiry. The Commissioner stated for the record: 'Mr. Brook, thank you for your evidence, you are discharged from summons, you are free to return to Singapore.