Sean Hennessy focuses his practice on white-collar and securities defense matters, including the defense of criminal and civil investigations brought by the Department of Justice (DOJ), the Securities and Exchange Commission (SEC), and State Attorneys General. Sean defends individuals and public and private companies against governmental investigations involving allegations of antitrust violations, securities and investment adviser fraud, insider trading, financial market manipulation, tax crimes and violations of the False Claim Act.

In addition, Sean has substantial experience conducting internal investigations, as well as representing parties in complex commercial litigation. Sean has been involved in numerous internal investigations in several industries, including investment banks, financial services and real estate investment trusts (REITs).

Sean previously served as judicial law clerk to the Honorable Virginia M. Kendall in the US District Court for the Northern District of Illinois. While in law school, Sean placed in several Loyola University Chicago internal and external moot court competitions, was staff editor of the Loyola University Chicago International Law Review and received CALI awards for earning the highest grades in his writing and advocacy classes.