Kemerer, Hannibal G. Williams II

Hannibal G. Williams II Kemerer

Senior Attorney

Hannibal G. Williams II Kemerer leverages his experience as a litigator and the relationships he developed as chief counsel for a US Senate Judiciary subcommittee to assist clients in achieving their compliance, litigation and regulatory goals. He has represented clients in a wide range of industries, including energy, agriculture, higher education, healthcare, medical devices, fisheries and municipalities.

Hannibal served as the chief counsel of the Senate Judiciary Committee’s Crime and Drugs Subcommittee, where he was the lead lawyer for Senator Arlen Specter. In this position, he was a principal Judiciary Committee lawyer to a five-term incumbent who had served as both Chairman and Ranking Member of the Committee.

He served on the Judiciary Committee staff during the Supreme Court confirmation hearings of Chief Justice Roberts, as well as Justices Alito, Sotomayor and Kagan, serving as Senator Specter’s lead lawyer on the hearings for Justices Sotomayor and Kagan.

Prior to his service on the Judiciary Committee staff, Hannibal was an Assistant General Counsel at the National Association for the Advancement of Colored People (NAACP) at its headquarters in Baltimore, where he maintained a nationwide litigation portfolio and helped orchestrate a multipronged strategy to obtain relief for African American visitors to Myrtle Beach, South Carolina during “Black Bike Week.” Before joining the NAACP staff, Hannibal litigated complex, multiparty employment cases at a Maryland law firm.

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  • Led country-specific (China) fact development in corporate FCPA defense for a large-scale multinational Department of Justice investigation.
  • Assisted in the successful defense of medical device manufacturer executives interviewed in connection with a DOJ/SEC parallel investigation of potential FCPA exposure in Mexico.
  • Assisted in the defense of a cabotage freight investigation conducted by the DOJ Antitrust Division.
  • Served on a team that successfully represented a publicly traded financial services company in a proxy fight and obtained a temporary restraining order the day before the shareholders meeting that enjoined a director and large shareholder from supporting a competing plan solicitation from dissident shareholders.
  • Assisting a healthcare litigation team in avoiding a physician client’s Department of Health and Human Services Office of Inspector General five-year federal exclusion order by successfully petitioning a US District Court to vacate the underlying criminal conviction pursuant to a rare writ of error coram nobis.
  • While on Senate Judiciary Committee staff:
    • Deposed the former US Attorney General’s Chief of Staff, former Director of the Executive Office of US Attorneys, interim US Attorney for New Mexico, and Associate Deputy Attorney General as part of the bicameral and bipartisan investigation into the requests for resignations of nine US Attorneys.
    • Conducted more than 20 depositions and reviewed evidence during an investigation into an SEC whistleblower’s allegations of unlawful influence.


  • George Washington University Law School, J.D., 1999
  • Arizona State University, B.A., 1996


  • District of Columbia, 2011
  • Maryland, 2000


  • U.S. Court of Appeals for the 4th Circuit
  • U.S. District Court for the District of Columbia
  • U.S. District Court for the District of Maryland
  • 2017 Presidential Leadership Scholar, aimed at identifying and fostering leadership to address society’s greatest challenges through innovative solutions.
  • Awarded NAACP’s Office of General Counsel, “Staff Lawyer of the Year,” 2004

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  • Speaker, “FCPA Flash Podcast with Professor Mike Koehler”, March 8, 2018.
  • Author, “Funding Update and Mandatory Minimum Sentencing Reform,” PORAC Law Enforcement News, December 2013.
  • Speaker, “Government Counsel as Gatekeeper,” The George Wythe Society and The Black Law Students Association, William and Mary Law School, Williamsburg, April 2, 2012.
  • Co-panelist, “Update on Sentencing Law: Supreme Court, Appellate, Legislation,” ABA Criminal Justice Section Fall 2010 CLE Program, Washington DC, November 5, 2010.
  • Co-panelist, “Second Annual Sentencing Advocacy, Practice and Reform Institute With Focus on Re-entry,” ABA Criminal Justice Section Fall 2009 CLE Program, Washington DC, November 6, 2009.
  • Co-panelist, “Fixing the Criminal Justice System Issue Forum Overview,” Congressional Black Caucus, Washington DC, September 26, 2009.
  • Co-panelist, “Practical Ethics in the Workplace: Representation, Conflicts and the Privilege,” Maryland State Bar Association, Young Lawyers Section, Baltimore, April 22, 2009.
  • Co-panelist, “Institutional Structure Panel,” Forensic Science for the 21st Century: The National Academy of Sciences Report and Beyond, Tempe, April 3, 2009.
  • Co-panelist, “Congressional Investigations: The Hurricane is Getting Closer,” MCCA’s 2009 CLE Expo, Chicago, March 19, 2009.
  • Co-panelist, “DOJ’s Policy for Prosecuting Corporate Fraud,” Edward Bennett Williams American Inn of Court Panel Discussion, Washington DC, January 15, 2009.

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