Mr. King began his career as an attorney as a Special Attorney in the Honors Program with the US Department of Justice, Criminal Division (Organized Crime and Racketeering Section) in Washington DC and Chicago, Illinois investigating and prosecuting Organized Crime and Racketeering cases. He then became an Assistant US Attorney with the US Attorneys office in Chicago, investigating and prosecuting criminal cases including bank and financial fraud, political corruption, and other criminal cases. He lead the investigation of and tried the then largest cash robbery in US history.

After entering private practice has lead the defense of numerous individuals and companies involved in grand jury investigations across the US and the UK. He has handled multiple grand jury proceedings across the country as well as investigations and criminal proceedings in several foreign jurisdictions. He has experience in numerous civil trials and hearings as well as mediations and arbitrations. He has tried almost every kind of civil case including fraud, products liability, securities and antitrust, environmental, patent infringement and other intellectual property.