Principal Forensic Accountant,Claims Preparation in London

Aon is looking for a Principal Forensic Accountant. As part of an industry-leading team, you will help empower better decisions for our clients by delivering innovative and effective solutions as part of our Aon Global Risk Consulting business group. You will report directly to the Managing Principal of Aon's Claims Preparation, Advocacy and Valuation (CPAV) team in the United Kingdom. The Principal Forensic Accountant is a senior technical and client-facing expert within Aon's Claims Preparation, Advocacy & Valuation (CPAV) practice. The role is responsible for leading the quantification of complex and high-value insurance claims, with a particular focus on business interruption losses, contingent BI, and other financial loss claims, as well as directing business interruption pre-loss studies and exposure assessments for Aon's major Commercial Risk clients. Operating as a trusted adviser to clients, insurers, and loss adjusters, the Principal Forensic Accountant sets the technical direction for engagements, provides authoritative views on methodology and policy application, and plays a key role in practice leadership, client development, and talent mentoring across CPAV.

Key aspects of the roles & responsibilities include:

• Leadership of Complex Claims Quantification: Lead the end-to-end quantification of complex, high-value and/or contentious insurance claims, including business interruption, increased cost of working, energy BI, cyber BI, supply chain losses, and other financial loss claims. Define and defend robust BI methodologies, ensuring alignment with policy terms, accounting principles, and commercial reality. Act as the technical authority on loss measurement approaches for complex claims, including scenario modelling, counterfactual analysis, and sensitivity testing. Review and challenge opposing methodologies proposed by insurers, loss adjusters, and expert advisers, supporting negotiation and resolution.
• Business Interruption Pre-Loss Studies & Exposure Assessments: Lead pre-loss business interruption studies, maximum foreseeable loss (MFL) and probable maximum loss (PML) assessments, and exposure modelling in support of client risk transfer strategies. Advise clients and broking teams on BI programme adequacy, indemnity periods, limits, sub-limits, and key financial assumptions. Translate complex financial outputs into clear executive-level insights for risk managers, CFOs, and insurers.
• Client Advisory & Stakeholder Engagement: Serve as a senior trusted adviser to Aon clients throughout the claims lifecycle, from initial loss event through to settlement and closure. Present complex analyses and conclusions through clear executive summaries, negotiation papers, and formal claim submissions. Lead senior-level discussions with insurers, loss adjusters, legal advisers, and other third parties, representing client interests with authority and credibility.
• Practice Leadership & Growth: Contribute to CPAV’s growth strategy, including the development of new service offerings, client propositions, and innovative approaches to claims quantification. Support internal collaboration across Aon (broking, analytics, cyber, construction, energy, power, and specialty lines) to expand CPAV’s reach. Maintain strong professional relationships across the claims, loss adjusting, and insurance advisory market.
• People, Quality & Risk Management: Act as a mentor and technical coach to senior and junior forensic accountants, providing guidance on methodology, judgement, and client management. Review and sign-off complex work products, ensuring technical excellence, consistency, and quality control across engagements. Operate in accordance with the Aon UK Limited Risk Management Framework and all relevant governance, compliance, and training requirements.

Skills and Qualifications:

• Extensive experience (typically 10+ years) in forensic accounting, claims consultancy, financial audit, loss adjusting, insolvency, or related disciplines.
• Experience as a qualified loss adjuster, forensic accountant, claims manager, claims consultant or equivalent; dealing with commercial lines and multinational clients a plus.
• Proven track record of leading complex, high-value or disputed claims involving multinational or large commercial clients.
• Strong financial accounting background with the ability to interpret management accounts, budgets, forecasts, and operational data.
• Excellent client advocacy, communication, and negotiation skills, with the ability to explain complex concepts to non-technical audiences.
• Strong policy interpretation, and technical insurance skills.
• Ability to work interpersonally with various project, internal, and client teams.
• Ability to effectively network.
• Experience in specialist lines (e.g. cyber, energy, power, infrastructure) is advantageous.
• Willingness to travel domestically and internationally, sometimes at short notice.
• MS Office proficiency essential.

Salary and Benefits:

This role offers a competitive salary and bonus, plus a comprehensive benefits package and 25 days holiday. Through our flexible benefits, you will also have the opportunity to choose additional benefits, including healthcare and additional holiday. We also offer tremendous potential with a growing worldwide organisation.