Carl focuses on regulation of broker-dealers, swap dealers, trading platforms, clearinghouses and other market participants. This includes advising on rules relating to a wide variety of regulatory matters, including status and registration, ongoing capital, customer protection, margin advice, market structure issues, the permitted scope of securities-related activities for banks and market and trading conduct rules. He also advises on regulatory matters for corporate transactions, examinations and investigations.

At the SEC, Carl served as the staff representative on the IOSCO Committee on Regulation of Market Intermediaries, worked on broker-dealer and security-based swap dealer registration and status issues, and advised the Director on a wide range of issues, including market structure, Dodd-Frank Act implementation, Regulation SHO, and broker-dealer registration and sales practices. Carl has also advised the Division of Enforcement on litigation and investigations.