Peter Simshauser has a diverse litigation practice concentrating on complex commercial cases. His experience includes trials, arbitrations and mediations, and arguments before federal and state appellate courts on matters on behalf of clients in many business sectors, such as financial services, investment banking, insurance, environmental, employment, and energy and resources.


Mr. Simshauser has represented clients in a variety of substantive areas, including securities, complex contract disputes, insurance bad-faith, environmental, mass and toxic torts, and Lanham Act and state law unfair trade practices. He also has advised clients in pending or threatened class action and individual litigation, administrative proceedings, corporate transactions and internal investigations.

Examples of his representations include:

  • a mutual fund complex in numerous matters, including claims of inappropriately allowing some investors to disadvantage others, of disadvantaging investors through fund brokerage practices, of overcharging funds for advisory services, and of improperly withholding compensation from senior employees;
  • the independent trustees of an asset management company alleged to have misled investors in the offering materials of mutual funds;
  • companies with legacy environmental exposures, including regulatory actions and multiparty litigation over contaminated river and ocean sediments;
  • officers and directors of a biopharmaceutical company alleged to have misled investors about the company’s business and financial prospects;
  • medical services companies alleged to have overcharged for diagnostic and therapeutic services;
  • a technology company alleged to have breached its fiduciary duty to shareholders in light of certain compensation practices for executives;
  • underwriters of stock and loan securities alleged to have issued misleading offering documents for various domestic and foreign companies, including a large foreign oil and gas company and domestic biotechnology companies;
  • a processor of rare metals used in the electronics and aerospace industries alleged to have breached a contract to purchase the ore output of a Brazilian mine;
  • insurance companies in various complex disputes, including over coverage and liability for historical events and claims; and
  • companies in disputes over hiring, termination and post-employment obligations of senior executives.

Mr. Simshauser also maintains an active pro bono caseload. Additionally, he is involved in firm management, including as a member of the selection committee for the Skadden Fellowship Program, which annually awards more than 25 fellowships in public interest law to graduating law students and judicial clerks.



  • J.D., Harvard Law School (1983) (cum laude)
  • B.S., University of Illinois (1980) (highest honors)
  • B.A., Augustana College (1979) (summa cum laude)


  • Massachusetts


  • Law Clerk, U.S. District Court, District of Northern Illinois (1983-1985)

Peter Simshauser