Marc co-founded Cooke, Young & Keidan in January 2009 and is recognised by the leading legal directories as one of the UK’s top disputes lawyers. Chambers & Partners describes him as ‘a great strategist’, and The Legal 500 says he has an ‘unrivalled commitment to client needs and great ability to think outside the box’

Marc advises on high value commercial litigation and international arbitration, including agency and joint venture disputes, partnership, shareholder and corporate disputes, as well as civil fraud and asset tracing cases. He also handles professional negligence actions, acting predominantly against investment managers, construction professionals, and law and accountancy firms. Much of Marc’s work has an international dimension and, in addition to having undertaken over the years extensive work with an EU or US connection, he has particular recent experience on cases with India and Africa dimensions, as well as cases connected to offshore centres.

Marc is well known for his work in the field of banking and financial services disputes, where he advises and acts for hedge funds and other investors and bank customers, in high-stakes and cutting-edge litigation against financial institutions. Marc has considerable experience in acting in disputes against the banks in relation to LIBOR, Forex and other benchmark rate fixing and manipulation, as well as cases involving the mis-selling of complex financial products and claims relating to breach of mandate and payments fraud. Marc’s arbitration work includes handling substantial cases across a number of industry sectors including mining and other commodities, as well as experience in bringing and defending challenges to arbitration awards in the English Court (brought under sections 68 and 69 of the Arbitration Act 1996).

Marc has substantial experience of complex High Court trials, as well as expertise in assisting clients to resolve disputes through mediation and other forms of alternative dispute resolution.


Marc obtained a First Class Honours degree from Manchester University and achieved a distinction in the Legal Practice Course undertaken at the College of Law, London. He trained with the international law firm, Simmons & Simmons, before joining the dispute resolution group of City of London firm Theodore Goddard upon his qualification as a solicitor in 1999. During his time with Theodore Goddard (subsequently Addleshaw Goddard after a merger) he acted for a number of blue-chip clients, both domestic and international, on various contentious matters, including complex High Court commercial cases. In January 2009 Marc co-founded Cooke, Young & Keidan.

What the legal directories say

Marc has for many years been ranked as a leading lawyer by the Chambers and Partners Guide, in both the banking litigation and commercial litigation categories. In the 2018 edition, market sources cited his “solutions-focused” manner and his skills as “a great strategist”. The 2017 edition commented that he is “a hugely energetic lawyer, a creative thinker and leaves no stone unturned” and that he is “absolutely passionate and determined”. The 2016 edition observed that he is “hard working and committed”, “really client-focussed” and “simply on the ball the whole time”.

Marc is also recommended by The Legal 500 Guide (2017 edition) in all of the Commercial Litigation, Financial Services, Civil Fraud and Banking Litigation Categories. He is ranked as a “Leading Individual” for Banking Litigation. The directory commends Marc for his “unrivalled commitment to client needs and [his] great ability to think outside the box” and for being “an irrepressible character whose litigation instincts are always spot on”. The 2016 edition praised his “total commitment” and described him as having “real expertise in banking-related disputes and an absolute determination to do the very best for his clients”.

Marc was listed in Thomson Reuters’ London “Super Lawyers” for Commercial Litigation.

Cases of Note

  • Gregg & Co. (Knottingley) Ltd. & Anor -v- Emhart Glass Ltd. [2005] EWHC 804 (TCC) – a Technology & Construction Court case, successfully acting for a customer in a claim concerning the supply of defective industrial equipment.

  • Dadourian Group International Inc -v- Simms and Others [2006] EWCA Civ 399 – a Court of Appeal decision in a substantial fraud case, concerning the exercise of the court’s discretion to permit a party to enforce a worldwide freezing order in a foreign jurisdiction.

  • A -v- B & Ors [2007] EWHC 54 (Comm) (23 January 2007) – a substantial Commercial Court case arising out of a fraud claim and trusts dispute, concerning an award of indemnity costs against a party where court proceedings were commenced in breach of an agreement to resolve disputes through arbitration.

  • Deutsche Bank AG and another -v- Highland Crusader Offshore Partners LLP and others [2009] EWCA Civ 725; [2009] WLR (D) 254 – a leading Court of Appeal authority in relation to the grant of anti-suit injunctions. The hedge fund, for which the firm was acting in respect of its defence of a US$ 70 million claim, was successful in the Court of Appeal in overturning the grant of an injunction preventing it from continuing its fraud proceedings commenced against the bank in Texas. The bank was represented by Allen & Overy.

  • RBS -v- Highland Financial Partners LP & Ors [2010] EWHC 3119 (Comm) – a significant judgment in a banking litigation case relating to a failed CDO issue which terminated in late 2008. The bank was subjected to judicial criticism for conducting a “sham” auction of leveraged loans and was found to have deceived its counterparty. Herbert Smith initially acted for RBS but were replaced by Linklaters in mid 2011.

  • RBS -v- Highland Financial Partners LP & Ors [2013] EWCA Civ 328 – a high profile case relating to a claim brought by RBS for an anti-suit injunction seeking to block fraud claims against the bank in Texas for more than $100 million. Highland, a Texas-based hedge fund client, counterclaimed that RBS had obtained a judgment from the Court by fraud. RBS’s claims were dismissed and the bank was found to have lied repeatedly to the Court. In the Court of Appeal, not only was the Commercial Court’s judgment upheld but the Court also struck down RBS’s judgment for fraud. RBS was represented by magic circle firm Linklaters. For  more details see our Press Release.

  • Symbion Power LLC v Venco Imtiaz Construction Company [2017] EWHC 348 (TCC) – We acted successfully for the defendant, Venco, in this High Court case where the Court rejected an application to set aside an ICC arbitration award for serious irregularity under section 68(2)(d) of the Arbitration Act 1996 on the basis that the tribunal had failed to deal with issues which were put to it. Mishcon de Reya acted for Symbion Power, the unsuccessful claimant.