Group Board

Ian Lowitt was appointed as a Director in November 2012 and became Chief Executive Officer in January 2016. He was previously at Barclays Bank where, after the acquisition of Lehman Brothers, he managed integration of the businesses and support functions, and served as the COO of Barclays Wealth America. Prior to Barclays, Ian spent 14 years at Lehman Brothers, latterly as Chief Financial Officer, and before that was Co-Chief Administrative Officer for the firm, responsible for Systems, Operations, Finance Risk and Expense Management. Prior to this role, he was the Head of Strategy, Global Treasurer and Head of Tax; and European Chief Administrative Officer. Ian has an MSc in Economics, and an MA in Economics, Philosophy and Politics from the University of Oxford, which he attended as a Rhodes Scholar, and a BSc and an MSc in Electrical Engineering from the University of Witwatersrand in Johannesburg.

Rob Irvin became Chief Financial Officer at Marex in April 2023. Rob was previously at HSBC for over ten years where he undertook various senior finance leadership roles. He was latterly the CFO of their Global Private Bank & Wealth business, focusing on implementation of structural change and execution of strategy, and prior to that as CFO of Global Banking, driving business change to raise capital efficiency and improve shareholder returns. Before HSBC, he was an assistant director in transaction services at Deloitte LLP, focusing on both financial and operational due diligence on major capital markets transactions. Rob is a chartered accountant, and has a BA (Hons) in Economics and Social History from University of York.

Sarah Ing joined the Group as an Independent Non-Executive Director in July 2021, becoming Chair of the Audit and Compliance Committee in March 2022 and the Senior Independent Non-Executive Director in October 2023. She is an experienced non-executive director in the financial services sector and has over 30 years’ experience in accountancy, investment banking and fund management. Previously, Sarah founded and ran a hedge fund investment management business and was also a top-rated equity research analyst covering the general financials sector. Sarah is also an independent non-executive director and committee chair at CMC Markets plc, City of London Investment Group plc, and XPS Pensions Group plc. She is a chartered accountant and has a BSc Hons in Botany from Durham University.

Konstantin Graf von Schweinitz joined the Group as an Independent Non-Executive Director in September 2021 and was appointed Chair of the Risk Committee in August 2022. Konstantin is an experienced banker, non-executive board director and advisor, with over 35 years’ experience in capital markets, investment banking, private banking and asset management. His current roles include acting as Independent Chair of SG Kleinwort Hambros Bank and as a Non-Executive Director at Egerton Capital. Konstantin previously held a variety of executive roles at Dresdner Group, including Head of Risk Management for investment banking. He has a BA and an MA in History and Economics from Oxford University.

Linda Myers joined the Group as an Independent Non-Executive Director and Chair of the Remuneration Committee (subject to regulatory approval) in January 2024. Linda has had an extensive career practicing corporate law, having been a senior partner at international law firm Kirkland & Ellis LLP until 2022. At Kirkland & Ellis, Linda served on its global management committee from 2010 to 2020 and focused her practice on debt financing transactions for a range of public and private companies. As well as chairing the committee responsible for all the firm’s policies, she was a member of two committees that were responsible for compensation. Linda has a strong track record of supporting diversity goals, having established a number of diversity-focused task forces and initiatives at Kirkland & Ellis. Linda also sits on the boards of the National Philanthropic Trust, Gibraltar Industries and LCI Industries.

Madelyn Antoncic joined the Group as an Independent Non-Executive Director in January 2024. Madelyn, a Ph.D. Economist and former World Bank Vice-President and Treasurer, is currently Senior Fellow at New York University, Development Research Institute. At the World Bank, from 2011 to 2015, Madelyn was responsible for overseeing every aspect of managing the bank’s and other official-sector institutions’ assets, as well as the bank’s capital, annual funding program, collateral and cash management, and daily cash payments and disbursements. She is a former Economist at the Federal Reserve Bank of New York; was Senior Advisor to the United Nations Conference on Trade and Development (UNCTAD) on Sustainable Development Goal (SDG) Reporting; and has held senior positions at Goldman Sachs, Barclays, Lehman Brothers, and Principal Global Investors. Her experience spans global markets across numerous asset classes in senior market and risk roles, and she is renowned for her leadership in financial innovation and risk management. Madelyn also sits on the board of ACWA Power; Weill Cornell Medicine; and is a Member of the UK’s Foreign, Commonwealth and Development Office Research Advisory Panel.

John W. Pietrowicz joined the Group as an Independent Non-Executive Director in April 2024. John served as Chief Financial Officer of the CME Group from 2014 until his retirement in April 2023. He has also served as a director on the boards of the World Federation of Exchanges and Bolsa Mexicana de Valores, and as a member of the Financial Accounting Standards Board Advisory Committee. John has also held financial leadership positions for Ameritech, after beginning his career as an auditor for Arthur Andersen. John holds a Bachelor of Business Administration in accounting from the University of Notre Dame and a Master of Business Administration in Finance from Loyola University Chicago. He is also a Certified Public Accountant.

Roger Nagioff represents the investor, JRJ Group, on the Marex Board. Roger is a Founding Partner of JRJ Group and has over 35 years of operating and investing experience in the financial services and real estate industries. Prior to co-founding JRJ Group, he served in various senior executive positions within Lehman Brothers, holding leadership roles in a number of business lines in Europe and the United States. Roger was Global Head of Fixed Income at Lehman Brothers, succeeding to the role from his previous position as Chief Operating Officer for Europe, and before that, as Co-Head of Global Equities. Roger holds a BA in law.

Henry Richards was previously a director on the Group board from 2018 to 2021, representing JRJ Group and was reappointed as a Non-Executive Director in April 2024. Henry has 15 years of experience in investment banking and private equity, with special focus on financial services. Since 2015, he has been at JRJ Group holding the role of Principal since 2018. From 2014 to 2015, Henry was a senior associate at Partners Capital LLP and prior to that, he was an investment banker at JP Morgan between 2010 and 2014. Henry holds a Bachelor of Arts (Honours) degree in Classics from Durham University.