Arthur W. Hahn, now retired, was the global co-chair of Katten's Financial Services practice and a member of the firm's Board of Directors. He represents major international banks and brokerage firms, international equity and commodity exchanges, and clearinghouses and technology companies in connection with their regulatory, business and litigation needs.

He represented major international banks and brokerage firms, international equity and commodity exchanges, and clearinghouses and technology companies in connection with their regulatory, business and litigation needs.
An experienced counselor to financial institutions, Arthur represented his clients' interests whether he was interfacing with exchanges, supervising regulatory compliance, advising on principal trading and sales practices issues, or overseeing litigation and enforcement matters. He provided valued guidance on business structuring and strategy, trading rules, technology initiatives, cross-border Securities and Exchange Commission (SEC) and Commodity Futures Trading Commission (CFTC) licenses, and international insolvency issues. In addition, Arthur counseled companies regarding capital formation and mergers and acquisitions.

His clients included the LIFFE Exchange, LCH.Clearnet Group, Bank of New York Mellon Corporation, The Mexican Derivatives Exchange (MexDer), Morgan Stanley, Barclays and CalPERS. He was regularly involved in enforcement matters and securities litigation and is a certified mediator, focusing on resolving financial instruments and markets disputes.

Hahn is a sought-after lecturer and author on subjects relating to all facets of financial services. He is a director of Bakkt Trust, a licensed New York Trust Company authorized to hold digital assets. He serves as chairman of the company’s Bank Secrecy Act (BSA) committee and as a member of the audit committee.

Hahn was a long-serving member of the Board of Directors of the Futures Industry Association (FIA). He is currently serving as a special advisor to the FIA Board, attending all of its meetings and serving on special committees. He also is a public director of the National Futures Association (NFA). He serves as a director of the Institute for Financial Markets and he has been chosen as an expert for P.R.I.M.E. Finance. In these various positions, Arthur participates in rulemaking and policy discussions which involve industry leaders, regulators and legislators.

Hahn has served as an Institute Trustee since 1989.