William F. Osberghaus, Jr.

Senior Associate

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.

Publications & News


January 3, 2010

Streptococcus pneumonia and Pseudomonas aeruginosa pneumonia induce distinct host responses

Co-authored with McConnell KW, McDunn JE, Clark AT, Dunne WM, Dixon DJ, Turnbull IR, Dipasco PJ, Sherman B, Martin JR, Walter MJ, Cobb JP, Buchman TG, Hotchkiss RS, Coopersmith CM, Critical Care Medicine, 2010 Jan; 38(1): 223-41.

Professional Activities

Mr. Osberghaus is a member of the American Bar Association.


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HBX | Harvard Business School, Credential of Readiness (CORe), Business Analytics, Financial Accounting, Economics for Managers, with High Honors, 2016

JD, magna cum laude, Washington University School of Law, 2012, Order of the Coif, Senior Executive Editor, Washington University Law Review, Don Summers Award

BA, Classics and Political Science, summa cum laude, Washington University in St. Louis, 2009, University Scholar, Eugene Tavenner Prize, Phi Beta Kappa, Eta Sigma Phi, Pi Sigma Alpha

Bar Admissions

District of Columbia

New York

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