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Mark is a highly experienced strategic tax advisor. Over his 30 years in tax, Mark has advised on numerous significant and complex transactions, disputes/litigation, negotiation support, policy and planning matters. Mark’s experience extends across a broad range of taxes and disciplines. His published technical work includes a guidebook on the taxation of derivatives, numerous articles for different tax publications on various subjects and Lexis Nexis’s guidance on transfer pricing rules. Mark trained at Price Waterhouse before spending 5 years as deputy head then head of tax at FTSE 100 companies. Mark was a tax partner at EY for 9 years from 2005 and Baker & McKenzie for 4 years from 2013.
“I founded ADE Tax in 2018 because I believed established leading advisors had lost the skill and appetite to provide the senior strategic tax advice which decision-makers most value. We set out to be deep generalists across different taxes and industries and analyse better in order to connect technical advice and decisions. Since formation, our firm and mission has attracted the most talented group of colleagues I have ever had the honour to work with.”
Martin joined ADE Tax in January 2021 from his role as head of operational and securities tax at Deloitte in London. Martin combines an unrivalled knowledge of securities and financial transactions taxation with a broad range of experience across all taxes, including M&A and capital markets fundraising. Martin’s published work includes the leading textbook on UK stamp duty as well as being widely published across broader tax publications. In addition, Martin is a member of the tax consultation board of Practical Law. Martin trained at Freshfields and moved to Slaughter and May as tax associate, before becoming EMEA tax counsel at Citigroup in London.
“I joined ADE Tax because I wanted to be part of building something meaningful and lasting which clients would value for many years to come. I wanted to team up with Mark and believe strongly in our founding mission of providing deep generalist tax advice which enables clients to execute and deliver their commercial strategy. One of the best aspects of advising here is the way in which each of us is able to deliver better advice through the input of colleagues and through building a broad network of the very best specialist experts around the world.”
Matt joined as an Associate Director in July 2023, and was promoted to Director in October 2025. Prior to joining ADE Tax, Matt spent 9 years at PwC, working in various teams across both Direct and Indirect Tax. Most recently, Matt was part of the Listed and Inbound team, working closely with some of the world’s largest companies. Matt has extensive experience in many areas of corporation tax, tax disputes/litigation, transfer pricing and VAT.
“I joined ADE Tax to free me to act as the trusted and strategic tax advisor that I have always sought to be. I do not want to feelconstrained by rigid structures and narrowly defined roles. At ADE Tax, I have the opportunity to learn faster and leverage expertise across various aspects of tax, enabling me to deliver more personalised and impactful advisory services. The environment has accelerated my learning and the fulfilment that comes with getting better.”
Claire joined ADE Tax in 2018. Claire trained in Price Waterhouse before joining a specialist tax software provider and then Arthur Andersen/Deloitte. Since 2005 Claire has combined company secretarial work with tax technology training.
“I had loved working with Mark Bevington at the start of my career in Price Waterhouse so when the opportunity came to work together again I jumped at it. The environment, atmosphere and ethos of ADE Tax really speaks to me. We have such a bright and optimistic approach to achieving the highest standards and a real buzz to our office.”
Jemima joined ADE in June 2024. Jemima trained as a lawyer in PwC Perth, Australia, working on a broad range of corporate tax and tax controversy matters for some of Australia’s largest listed corporates and privately owned businesses. In May 2021, Jemima joined the international transaction tax team at EY, working on some of the largest market cap deals in the UK and European markets for private equity clients.
“I joined ADE Tax seeking more variety in my work and more freedom and flexibility of thought. Essentially, I wanted to work in a way that suited my clients and strengths and allowed me to challenge perceived wisdom. The approach and philosophy of the ADE Tax team has aligned with this. ADE Tax approaches problems with a total focus on the best way forward. From day one, I feel like my ideas have counted and my pace of learning has increased.”
