Derek
Patterson
Partner
London
English
Derek Patterson has over 25 years’ experience leading complex forensic accounting investigations and providing consulting and testifying support in litigation and international arbitrations. Recognized as a “highly sought after forensic expert,” he is known for his expert witness testimony, clear analysis, and pragmatic advice.
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Prior to joining FRA, Derek held roles at easyJet plc, British Airways’ low-cost airline (go), and Ford Motor Company. Derek completed his training as an accountant and auditor with PricewaterhouseCoopers and holds a Bachelor of Accountancy degree from the University of Glasgow.
- PCA Arbitration: Provided four expert reports (three jointly) covering quantification of damages in a counterclaim, together with a range of forensic accounting issues including asset financing, fraud, and red flags. Cross-examined before the Tribunal.
- Accounting and Reporting: Led a major investigation for a global OEM into long-term revenue and profit recognition under IFRS 15, covering contract obligations under IAS 37 and materiality of adjustments under IAS 8.
- Regulatory Gain and Disgorgement: Led the forensic accounting support for a global medical device group negotiating a long-running resolution with the Brazilian authorities.
- Shareholder Litigation: Served as expert witness for a co-defendant in Austrian Commercial Court shareholder litigation claims, investigating and quantifying a complex EUR 2b securities and real estate fraud and subject to cross-examination by the claimants and the hostile co-defendant.
- England & Wales Litigation: Provided an expert report (County Court) for the defendant of a claim for lost profits arising from the alleged breach of a property leasing agreement.
- Whistleblower Investigation: Led the forensic accounting support for an investigation of alleged corruption in transactions via a distributor of pharma products in Africa.
- Nordic Bank: Led the independent forensic review arising from public money laundering allegations. Conducted a sweeping network analysis and control and influence review to identify targeted customer relationships across varying degrees of connection.
- Telia Company: Quantified and presented disgorgement and gain analyses arising from the company’s Uzbekistan operations to the US DOJ, US SEC, the Netherlands’ Openbaar Ministerie, and the Swedish Public Prosecutor.
2024-2025 Consulting Experts - Forensic Accountants, Lexology Index
2024-2025 Investigations Forensic Accountants, Lexology Index
2023 Global Leader - Consulting Experts - Forensic Accounting, Lexology Index
2019, 2022 and 2023 Global Leader - Investigations Forensic Accountants, Lexology Index
2021 Global Leader - Forensic Accountants, Lexology Index
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Biography
Derek Patterson has over 25 years’ experience leading complex forensic accounting investigations and providing consulting and testifying support in litigation and international arbitrations. Recognized as a “highly sought after forensic expert,” he is known for his expert witness testimony, clear analysis, and pragmatic advice.
What our clients say
"Derek manages the team brilliantly and is a pleasure to deal with."
Client Reference
Chambers and Partners, Litigation Support, eDiscovery Support UK 2024
What our clients say
What our clients say
"Derek demonstrates mastery of the technical subject matter"
Client Reference
Lexology Index
What our clients say
What our clients say
“Derek Patterson is a highly regarded practitioner with a wealth of expertise in crossborder forensic accounting. He has a strong expert witness practice and is regularly engaged as an expert in complex disputes.”
Client Reference
Lexology Index
What our clients say
What our clients say
“Derek is a go-to forensic accountant and an extremely strong investigator.”
Client Reference
Lexology Index
What our clients say
What our clients say
Derek Patterson is widely recognised in the market for his "top-tier forensic accounting practice" and "excellent work output within a great team".
Client Reference
Lexology Index
What our clients say
What our clients say
Derek’s “forensic accounting skills are second to none.” For peers and clients, “Derek is a go-to forensic accountant and an extremely strong investigator.”
Client Reference
Lexology Index
What our clients say
Awards & Recognition
2024-2025 Consulting Experts - Forensic Accountants, Lexology Index
2024-2025 Investigations Forensic Accountants, Lexology Index
2023 Global Leader - Consulting Experts - Forensic Accounting, Lexology Index
2019, 2022 and 2023 Global Leader - Investigations Forensic Accountants, Lexology Index
2021 Global Leader - Forensic Accountants, Lexology Index
Accreditations
No items found.
Languages
English
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