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John Fisher

John Fisher

PwC7 More London RiversideLondonEnglandSE1 2RT

Global Leader

WWL Ranking: Recommended

WWL says

John Fisher specialises in the financial elements of commercial disputes, and earns plaudits for his ability to “explain difficult concepts well”.


John helps clients investigate, analyse and resolve disputes. He is a forensic accountant specialising in the financial aspects of commercial claims and disputes, supporting clients in commercial claims, regulatory reviews, criminal matters and expropriation claims. He acts as both an adviser and an expert witness. He brings to bear a forensic mindset to analyse complex problems and help clients find solutions.

John is recognised as a leader in three main areas: issues arising in M&A; assessment of lost profits and valuation of damages; and acting as independent expert in expert determinations.

In M&A transaction matters, he has huge experience assisting clients with issues arising in transactions including completion accounts process matters, earn-out disputes, pre/post-deal leakage reviews and breach of warranty claims.

As an adviser he brings insight to complex situations and to establishing the impact of events. He has very substantial experience in corporate transactions and has helped clients shape, execute and interpret sale and purchase (and other) agreements. He has deep understanding of value in transactions.

As an expert witness, John’s strength is in articulating complex financial issues for courts, tribunals and arbiters. Clients feedback that he is pragmatic, reasonable and fair, insightful and quick. He is skilled in articulating and challenging value assessments in actual and hypothetical counterfactual situations.

John has given evidence many times in proceedings in the UK and overseas: in the UK High Court, arbitrations (including LCIA, ICC, DIFC), the Competition Appeals Tribunal and disciplinary proceedings.

He has advised clients in a wide range of disputes including those related to insolvency proceedings, loss of profits claims in breach of contract, breach of warranty, professional negligence, insurance claims and a wide range of transaction-related matters.

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