Paul draws upon his deep understanding of the inner workings of enforcement authorities to represent clients facing regulatory and criminal enforcement actions. Working in jurisdictions with a high degree of compliance risk, he advises individuals, multinationals and other global organizations. According to Chambers USA, market sources "have great regard" for Mr. Butler and consider him a "really outstanding" lawyer whose “practice focuses largely on advising clients during major internal and government-led investigations” and “cases with significant international elements.”

As an AUSA, Paul prosecuted major terrorism cases, gaining insight into how the Department of Justice (DOJ), the FBI, and intelligence agencies investigate and make cases to bring them to trial. He also dealt with many cross-border investigations, gaining a strong understanding of how U.S. law enforcement and regulatory agencies deal with their foreign counterparts. This included serving as one of the trial prosecutors in United States v. Osama Bin Laden, et al., the U.S. government’s indictment of the leadership of al Qaeda prior to the 9/11 attacks, which resulted in the successful convictions, after a six-month trial, of four defendants for their roles in the attacks on the American embassies in Kenya and Tanzania in 1998. 

In his role at the Pentagon, he was steeped in crisis management, dealing with issues around highly consequential situations, including Abu Ghraib, Guantanamo and Fallujah. His time in government also gave him an invaluable network of contacts. 

Paul provides advice on investigations and other enforcement actions involving:

• Foreign Corrupt Practices Act (FCPA)
• Securities laws
• Federal contracts
• Electronic surveillance
• Export controls
• Sanctions laws and regulations.