William F. Osberghaus, Jr. is a partner in the Government, Regulatory & Internal Investigations practice group of Kirkland & Ellis LLP. William’s practice focuses on conducting internal investigations and representing public companies, financial institutions, investment advisers, accounting firms, and individuals in connection with a broad range of enforcement investigations involving the federal securities laws and related rules and regulations, including investigations conducted by the U.S. Securities and Exchange Commission (SEC), the Financial Industry Regulatory Authority (FINRA), and the Public Company Accounting Oversight Board (PCAOB). He also has appeared before the Department of Justice (DOJ), the Consumer Financial Protection Bureau (CFPB), the Federal Trade Commission (FTC), and state Attorneys General.


Thought Leadership


Co-Author, “The SEC’s New Approach to Neither-Admit-Nor-Deny Policy May Not Be So New After All,” New York Law Journal, 2021 

Co-Author, “Neither Admit Nor Deny Settlements from the Stanley Sporkin Era: Wise Policy or Outdated Enforcement Notion,” 43 Sec. Reg. L.J. 29, 2015

Co-Author, “Streptococcus Pneumonia and Pseudomonas Aeruginosa Pneumonia Induce Distinct Host Responses,” Critical Care Medicine, 38(1): 223-41, January 2010


Admissions & Qualifications

  • District of Columbia
  • New York


  • Harvard Business School OnlineCredential of Readiness (CORe)Business Analytics, Financial Accounting, Economics for Managers, with High Honors2016
  • Washington University School of LawJ.D.magna cum laude2012

    Order of the Coif

    Senior Executive Editor, Washington University Law Review

  • Washington University in St. LouisB.A., Classics & Political Sciencesumma cum laude2009

    University Scholar

    Phi Beta Kappa

    Eugene Tavenner Prize

    Pi Sigma Alpha

    Eta Sigma Phi