Executive Team

Paul Chou

Chief Executive Officer, Co-Founder

team_paulPaul L. Chou is an experienced securities trader, software engineer and financial entrepreneur. Prior to assuming his current position, Paul co-founded and ran Opez, a software company which received funding from the prestigious Y Combinator program, a startup accelerator fund which has sponsored Dropbox, Reddit and Airbnb. Prior to Opez, Paul was a trader on the Quantitative Cash Trading desk within the Securities Division of Goldman Sachs, where he was responsible for the development, trading and risk management of algorithmic equity trading strategies for U.S. and Japanese markets.

Paul received a B.S. in Computer Science and a B.S. in Mathematics from the Massachusetts Institute of Technology. While at MIT, he worked in the Laboratory for Financial Engineering to develop models of market participant behavior in limit order books given the introduction of stochastic, asymmetric information.

In January 2016, Paul was appointed to the CFTC’s Technology Advisory Committee (TAC), which was created in 1999 to advise the Commission on the impact and implications of technological innovations on financial services and the futures markets, and the appropriate legislative and regulatory response to increasing use of technology in the markets.

Juthica Chou

President and Chief Risk Officer, Co-Founder

Juthica B+WJuthica Chou spent 7 years as a derivatives trader within the Securities Division of Goldman Sachs, where she specialized in algorithmic trading. Juthica began her career as an options market-maker on the Quantitative Volatility Trading desk, where her product scope ranged from equity and index options to VIX, treasuries, currencies and commodities. She later joined the Single Stock Volatility desk, where she traded dispersion and variance swaps and focused on the automated quoting of packaged trades.

Juthica received a B.S. in Mathematics with Computer Science from the Massachusetts Institute of Technology.

Zach Dexter

Chief Technology Officer, Co-Founder

Zach B+WZach Dexter is an experienced software engineer, project manager and technology architect. Prior to assuming his current position, Zach was Lead Software Engineer at Tutorspree, where he built out the full stack for an extensive set of internal tools and external-facing features. Prior to Tutorspree, Zach was a Principal at Databracket, where he built out the full technology stack and managed software engineers for a number of technology start-ups, including IceCharge, a credit card fraud prevention venture.

Zach received a B.A. in Computer Science from the University of North Carolina at Chapel Hill. He also attended Recurse Center, the selective NY-based technology education program.

Shabana Paul

Chief Financial & Operating Officer

Shabana B+WShabana Paul has over 15 years of experience in the financial services industry. Prior to assuming her current position, Shabana was the Business Unit Manager for the Global Quantitative Trading business within the Securities Division of Goldman Sachs, where she was responsible for key financial and operational aspects of the business, including business restructurings and strategic initiatives, market research and analysis, business planning and forecasting, expense management, and external and internal client relationship management. Shabana joined Goldman Sachs in 2004 as an analyst within the Finance Division, where she worked as the Senior Accounting Officer for Goldman’s Hull Trading businesses.

Shabana received a B.S. in Finance and in Information Systems, as well as an M.B.A., from New York University.

Ian Darrow

General Counsel & Chief Compliance Officer

Ian J. Darrow is an experienced attorney who has advised some of the world’s most sophisticated technology companies and investment firms on strategy, governance and transactional matters. Prior to joining LedgerX, Ian practiced in the Washington, D.C. office of Goodwin Procter LLP, where he advised clients on a range of matters including mergers and acquisitions, minority investments, regulatory compliance, securities issuances and general corporate governance. As part of Ian’s practice, he counseled clients on compliance and risk management issues raised by the use of novel technologies in the finance sector. His work also included analyzing target companies’ compliance with U.S. and foreign laws and regulations and making recommendations for remediation.

Ian received a J.D. from Duke University and a B.A. in economics from Denison University. Prior to his time at Goodwin, Ian served as an infantry officer in the United States Marine Corps.


Ledger Holdings Inc. Independent Directors

Mark Wetjen

Managing Director, Head of Global Policy at The Depository Trust & Clearing Corporation (DTCC)

Mark was nominated by President Barack Obama in March 2011, and was unanimously confirmed by the U.S. Senate, to serve as commissioner on the CFTC. Mark served as commissioner from October 2011 to August 2015, including 5 months as acting chairman in which he managed daily operations, set overall policy direction of the agency and served as a principal on the U.S. Financial Stability Oversight Council. During his tenure, Mark oversaw implementation of the first trading mandate for certain interest rate and credit default swaps and supported and helped craft over 90 proposed and final CFTC rules and orders implementing Dodd-Frank. He also was a sponsor of the CFTC’s Global Markets Advisory Committee.

Prior to joining the CFTC, Mark worked for 7 years in the U.S. Senate as a senior leadership staffer advising on all financial-services-related matters, including the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010.

Robert P. Castrignano

Principal, Equities Division of Sandler O’Neill + Partners, L.P.

As one of four Principals in the Equities Division, Bob is responsible for managing the firm’s trading and distribution business. He joined the firm in October 2001 after spending 20 years at Goldman Sachs & Co., where he was most recently an Executive Director in the Private Wealth Management Group in Hong Kong.

While at Goldman Sachs, Bob helped build the firm’s private wealth management businesses in Hong Kong and Singapore. He was part of a team that researched, developed and implemented investment strategies for sophisticated clients and cultivated strong business relationships with many of the Pacific Rim’s wealthiest families. Prior to this, Bob spent 12 years in operations, technology and equities management in New York, London and Tokyo.

Bob is Chairman of the Board of The Family Office Co. BSC, a multi-client family office based in Bahrain. He is also on the Board of the Lymphoma Foundation, which is affiliated with Memorial Sloan-Kettering Cancer Center in New York, actively supports the Hong Kong Society for the Protection of Children, and is a Patron of the Arts in the Vatican Museums.

LedgerX LLC Independent Directors

Ananda Radhakrishnan

Partner, Norton Rose Fulbright

Ananda focuses his practice on all matters relating to commodities and derivatives law and regulations. He represents infrastructure operators such as clearinghouses, exchanges, swap execution facilities and trade repositories, intermediaries such as futures commission merchants, money managers, and commodity trading firms. He also works collaboratively with his colleagues throughout the Norton Rose Fulbright global firm to provide coordinated solutions for our clients on complex cross-border compliance challenges. He has extensive knowledge of the industry and in-depth understanding of the Commodity Exchange and Dodd-Frank Acts and CFTC regulations, and is a regularly invited to speak at industry conferences in the United States, Europe and Asia.

Ananda joined Norton Rose Fulbright’s Washington, DC office in 2014 after serving the previous 12 years at the Commodity Futures Trading Commission. Most recently, he was Director of the Division of Clearing and Risk. Previously, he served as the Director of the former Division of Clearing and Intermediary Oversight. During his tenure at the CFTC, Ananda testified twice before the United States Congress on clearing related matters and has made numerous presentations to foreign regulatory authorities and industry panel discussions on the CFTC’s program for the oversight of clearing organizations and the protection of customer funds. He was also the CFTC’s lead representative on the international body that set the standards for the supervision of financial market infrastructures.

Carl Mahler

Partner, Gelber Group

Carl founded and runs the algorithmic trading business at Gelber Group. He leads a group of 30 software developers, traders and researchers, overseeing all aspects of the lifecycle of automated trading strategies, from idea conception to research to implementation, deployment, and operations. Carl sits on the firm’s committee responsible for dictating trading strategies and identifying revenue streams.

Carl received a Bachelor of Science in Electrical Engineering and Computer Science from MIT.