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Bryan Cave Leighton Paisner LLP

Living Wage
Work 020 3400 1000
Fax 020 3400 1111
Abu Dhabi, Atlanta, Beijing, Berlin, Boulder, Brussels and 33 more

Mark Lewis

Work 020 3400 4214
Bryan Cave Leighton Paisner HRO

Work Department

Commercial practice, IT and outsourcing.


Mark is a partner and head of both the Commercial practice and the firm-wide technology group. He has over 30 years of experience as a specialist commercial, IT and outsourcing lawyer and is one of the recognised leaders of the field. Mark was the non-executive chairman and a non-executive director of Morgan Chambers plc (now part of KPMG), one of Europe’s leading outsourcing consultancies. Amongst his legal peers, this gives him a unique perspective on best practice in the global outsourcing industry. He was involved in the first and largest outsourcing projects in the UK when senior counsel to the UK Government in the 1980s. Pioneer of offshore outsourcing, including some of the earliest projects in setting up Indian and other offshore captives and build operate transfer (BOT) structures for major Western corporates. Represents customers and providers in IT and outsourcing (including some of the biggest global providers), which enables him to understand and help cement IT and outsourcing relationships from either side.


Called to Bar of England and Wales, Lincoln’s Inn, 1982 (Hardwicke Scholar); admitted as a solicitor of the Supreme Court of England and Wales 1991. Assistant Parliamentary Counsel in the Parliamentary Counsel Office, senior legal counsel to HM Treasury, and also served other UK government departments 1983-89; senior associate at Warner Cranston (now Reed Smith, London 1989-1991; senior associate and later partner and head of the Intellectual Property Group at Stephenson Harwood, London 1991-97; founding partner, senior partner, joint senior partner and chairman of Arnheim Tite & Lewis (on merger of Tite & Lewis and Arnheim & Co) and Tite & Lewis, each the law firm associated, respectively, with PwC UK and Ernst & Young UK 1997-2004; global leader of the IT and e-commerce law networks of PwC and EY 1997-1999, 2000-2004; partner and head of the IT and outsourcing practice at Lawrence Graham LLP (now Gowling WLG), London 2004-06; partner, head of outsourcing practice and latterly head of the Commercial practice at Berwin Leighton Paisner LLP, London 2006 to date. Also non-executive director of Cosector, an IT, careers guidance and student housing services subsidiary of the University of London, and a non-executive adviser to the Trustees of the University of London for those services.


Honourable Society of Lincoln’s Inn; Law Society of England and Wales; International Technology Law Association; Naval & Military Club, London.


University of Cape Town (1976 BA); University of Warwick (1980 LLB Hons); London School of Economics and Political Science (1981 LLM), Inns of Court School of Law (1982, Bar Final Examination).

London: Corporate and commercial

Commercial contracts

Within: Commercial contracts

Bryan Cave Leighton Paisner LLP resulted from a merger between Berwin Leighton Paisner LLP and US firm Bryan Cave in April 2018, with its UK-based commercial group forming a key part of a larger international practice. Richard Shaw leads the team, which includes Marcus Pearl ('quick to identify key issues') and 'technically brilliant' Usman Wahid. The group's first-rate reputation in commercial contracts garners complex, business-critical work from clients in sectors such as financial services, real estate and media, among others. Carol Osborne spends the majority of her time undertaking matters in the retail and luxury brands sector. In 2017, Pearl and senior associate Louis Wihl acted for Bay State Milling Company in its groundbreaking licensing arrangement with Arista Cereals Technologies to commercialise the first high-amylose crop in the United States. Elsewhere, the team is increasingly active in strategic data monetisation and ad tech projects. In addition, the firm has a first-rate global outsourcing practice, which spans areas such as IT infrastructure, facilities management, healthcare, and general and life insurance, among others. Melissa Manski, Mark Lewis, Mimi Curran and Charlotte Pham are recommended.  

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London: TMT (technology, media and telecoms)

IT and telecoms

Within: IT and telecoms

Bryan Cave Leighton Paisner LLP's 'responsive and hard working' technology practice offers 'very solid advice' at 'good value for money'. The group has significant transactional expertise and acted for DXC Technology on the share acquisition of Swiss-based company LLX Global Business Services and its UK subsidiary. Additionally, a team led by Marcus Pearl advised the management of Exactpro Systems on a management buyout of Exactpro from the London Stock Exchange Group. Usman Wahid , alongside Pearl and outsourcing lawyer Mark Lewis,  jointly heads up the firm's technology practice, which recently hired Daniel Csefalvy from Linklaters LLP . He has experience advising on financial services technology, cryptocurrencies and crypto-exchanges. Senior associate Ash Von Schwan, who arrived from White & Case LLP, is another new addition to the non-contentious team.

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Legal Developments by:
Bryan Cave Leighton Paisner HRO

  • Bryan Cave Leighton Paisner (Russia) LLP acts for OOO Double against Vkontakte

    Bryan Cave Leighton Paisner (Russia) LLP is acting for Skolkovo resident OOO Double in a dispute with VKontakte over the Client’s use of public data from the social network in a search engine manner. The Double Data software involved was developed by our Client on the basis of its own big data search, storage and mining methods and algorithms.
    - Bryan Cave Leighton Paisner LLP

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