Caitlyn M. Campbell, a former US Securities & Exchange Commission (SEC) Enforcement Attorney, co-leads the firm’s SEC enforcement practice. She represents clients in SEC investigations, securities class action and derivative litigation and compliance matters. With more than two decades of experience in public service and private practice, Caitlyn advises on complex issues involving alleged violations of federal securities laws, including accounting fraud, disclosure and internal controls-related violations, regulatory violations by investment advisers and broker-dealers, insider trading, market abuse, anti-corruption and Foreign Corrupt Practices Act (FCPA) violations and whistleblower claims. She also assists companies in developing training programs and compliance policies and procedures.

Before joining McDermott Will & Schulte, Caitlyn served eight years at the SEC, including as Senior Counsel to the Directors of Enforcement, assisting with the management of the Commission’s largest division. At the SEC, Caitlyn led all aspects of investigations involving accounting fraud, complex insider trading schemes, market abuse, market manipulation, misappropriation of investor funds, investment adviser fraud and the Immigrant Investor Program. She also coordinated complex, cross-border investigations with foreign regulators. In addition to her investigative work, Caitlyn co-chaired the New England region committee that focused on proactively identifying accounting and disclosure fraud and served as liaison to both the SEC’s national Financial Reporting and Audit Group and the Boston FBI.

Caitlyn has conducted numerous internal investigations for major public companies, their boards of directors, and board committees.  She has represented public companies, audit firms, senior executives, registered investment advisers, hedge funds and private equity firms in matters before the SEC, US Department of Justice (DOJ), and the Financial Industry Regulatory Authority (FINRA). Her litigation experience includes representing corporations, directors, and officers in securities class actions and shareholder derivative suits. She has also advised clients in Special Purpose Acquisition Company (SPAC)-related litigation and SEC investigations.

A frequent speaker on enforcement, accounting fraud, and internal investigations, Caitlyn is recognized for her deep understanding of the intersection between regulatory expectations and corporate governance.

Paul Helms helps clients navigate their most serious securities and fraud-related challenges, acting as both a trusted counselor and steady advocate. A former senior attorney at the Securities and Exchange Commission (SEC), where he served as counsel to the Director of Enforcement, Paul draws on his government experience to defend clients in SEC enforcement matters, internal investigations, and private securities litigation.

As the co-lead of McDermott Will & Schulte’s SEC enforcement practice, Paul represents public companies, investment advisers, accounting firms, and corporate leaders nationwide. He knows that investigations and lawsuits are not just legal matters – they can be personally and professionally disruptive. Paul’s approach centers on clear communication, practical strategy, and securing the best possible outcome while minimizing the impact on clients’ lives and businesses.

With experience on both sides of the table, Paul has handled the full spectrum of SEC matters: accounting and disclosure issues, investment adviser and broker-dealer compliance, offering fraud, market manipulation, public finance, Foreign Corrupt Practices Act (FCPA), insider trading, and professional liability. He has led high-profile internal investigations into complex fraud and compliance problems and successfully defended clients in shareholder derivative suits and securities class actions, achieving dismissals and favorable settlements.

Paul also dedicates time to pro bono work. He serves as external general counsel of Episcopal Charities in Chicago and has led fraud-related investigations for nonprofit organizations. Earlier in his career, Paul clerked for Judge James H. Michael Jr. of the US District Court for the Western District of Virginia and served as editor in chief of the Vanderbilt Law Review. He is a Chartered Alternative Investment Analyst (CAIA) and a Certified Fraud Examiner (CFE).

Douglas (Doug) I. Koff focuses his practice on high-profile and high stakes civil, enforcement, and criminal matters, including investigations.

Doug is a nationally recognized litigator who represents corporations, a variety of financial institutions (i.e., banks, broker-dealers, hedge funds, private equity funds), boards of directors, special committees, and corporate executives. In this regard, he has advised and defended entities and corporate executives in inquiries by civil and criminal authorities (as well as self-regulatory organizations) into business practices that have been questioned by regulators as well as insider trading matters.

He has also handled major civil litigations and arbitrations involving a broad spectrum of substantive legal issues. Doug is also involved in bankruptcy matters where he leads and supervises the litigation aspects of the matters. Additionally, he has handled civil and criminal matters involving allegations of antitrust violations.

Doug has been recognized as a leading lawyer by multiple directories and publications, including Chambers USA and Legal 500 US, the latter of which referred to him as offering “remarkable insight, work ethic and tenacity.” He is also recognized as one of the top-rated White Collar Crimes lawyers in New York City by Thomson Reuters Super Lawyers.

Chambers noted that Doug is “hard-working, attentive and client-focused,” “extraordinarily focused and tenacious,” and “a smart, thorough litigator who is always on top of things.” Chambers also noted that he “has everything on his radar screen” and has a “remarkable ability to get along with anyone, making it his business to develop a rapport with other attorneys involved in his cases.”

He has also received the Burton Award for Distinguished Legal Writing.

Doug is very active in impact pro bono matters, where he spends a significant amount of time.