About the Directors

Brook Ballantyne

Director / Investigator

Brook Ballantyne is a Director and Investigator with over 17 years of experience in the private investigation industry. His career spans fraud and theft investigations, surveillance operations, tracing, and desktop intelligence. He has worked with insurers, government agencies including ACC, the Serious Fraud Office, and the Commerce Commission, as well as corporates and private clients, both within New Zealand and internationally.

Brook specialises in insurance fraud investigations and complex case analysis, with a focus on direct claim investigations, pattern identification, and the development of actionable intelligence. His work ranges from exposing organised fraud networks to handling sensitive claims involving serious injury or sudden death.

He applies a methodical, technology-driven approach, integrating desktop intelligence, physical and digital surveillance, forensic analysis, and detailed factual inquiries.

Whether reviewing financial records, conducting interviews, or advising on fraud prevention strategies, Brook delivers accurate, evidence-based outcomes aimed at protecting assets and reducing loss.

Brook is a member of the New Zealand Institute of Private Investigators (NZIPI) and the World Association of Detectives (WAD), reflecting his commitment to professional standards and international investigative practice.

He is a Certified Internet Research Specialist and holds certifications in general insurance fraud detection and vulnerability handling. He is also trained in the General Insurance Code of Practice (GICOP), ensuring investigations are conducted with integrity, fairness, and in alignment with industry standards.

Based in Auckland, Brook is available for both domestic and international instructions.

Nigel Rundle

Director / Investigator

Nigel is a licensed private investigator and co-director of GTI. He brings a solid background in law enforcement and private-sector investigations, with experience spanning tactical crime work, insurance fraud, factual inquiries, and complex case management.

He began his investigative career with the New Zealand Police, where he spent several years in frontline and specialist roles, including time in the Tactical Crime Unit, investigating volume crime. His policing work developed his strengths in interviewing, evidence gathering, decision-making under pressure, and managing investigations from first response through to prosecution.

After leaving the Police, Nigel moved into private investigations with a focus on insurance fraud and factual inquiries. He has worked on a broad range of matters involving suspicious claims, theft, liability disputes, tracing, and cross-border enquiries. His approach is careful, practical, and detail-driven — producing clear, balanced findings that clients can rely on.

At GTI, Nigel oversees investigations throughout New Zealand and internationally, ensuring each matter is handled with professionalism, discretion, and proper legal compliance. He continues to work as a hands-on investigator, regularly conducting interviews, reviewing evidence, visiting scenes, and preparing comprehensive reports for insurers, legal professionals, and corporate clients.

Nigel is a member of the New Zealand Institute of Private Investigators (NZIPI) and World Association of Detectives (WAD), underscoring his commitment to professional standards and internationally recognised practice.

He is based in Auckland and is available for domestic and overseas instructions.