William F. Osberghaus Jr.

William Osberghaus focuses his practice on representing both individuals and corporations in investigations brought by the Securities and Exchange Commission, the Financial Industry Regulatory Authority (FINRA), and the Public Company Accounting Oversight Board (PCAOB). In addition to maintaining an active practice defending the independence of various accounting firms, he has experience representing individuals in investigations of alleged insider trading and broker-dealers in investigations involving best execution and Regulation NMS.

Mr. Osberghaus was a summer associate in WilmerHale’s DC office in 2011. Prior to joining the firm, he served as a research assistant to two Washington University School of Law professors. With Professor John Inazu, he researched First Amendment protection for online groups and religious groups. With Professor Pauline Kim, he researched deficiencies in the traditional application of the principal-agent relationship between the US Supreme Court and lower federal courts. He also worked as an intern for his United States congressman and performed research at both the Washington University School of Medicine and the St. Louis University School of Public Health.

While in law school, Mr. Osberghaus was a member of the Washington University Law Appellate Clinic, through which he helped obtain a new trial for an inmate whose civil rights had been violated.

Insights & News


  • Education

    • Harvard Business School Online, 2016

      Credential of Readiness (CORe), Business Analytics, Financial Accounting, Economics for Managers, with High Honors

    • JD, Washington University School of Law, 2012

      magna cum laude Order of the Coif, Senior Executive Editor, Washington University Law Review, Don Summers Award
    • BA, Classics and Political Science, Washington University in St. Louis, 2009

      summa cum laude University Scholar, Eugene Tavenner Prize, Phi Beta Kappa, Eta Sigma Phi, Pi Sigma Alpha
  • Admissions

    • District of Columbia

    • New York