Daniel S. Mayerfeld

Daniel S. Mayerfeld

Counsel, Complex Litigation and Trials
Daniel Mayerfeld has extensive experience representing public and private companies and individuals in complex commercial litigation, including disputes relating to mergers and acquisitions and commercial contracts.


Mr. Mayerfeld’s experience includes representing clients in federal and state tribunals in all phases of litigation, including corporate reorganizations. In addition, he has experience defending civil investigations and conducting internal investigations in anti-corruption, fraud, securities and related matters.

Mr. Mayerfeld has advised, among others:

  • a refinery software company in a multimillion-dollar federal litigation involving misappropriation of trade secrets, copyright infringement and covenants not to compete;
  • a major bank in its successful $69 million breach-of-contract case focusing on a “most favored nations” clause in a settlement agreement;
  • a plaintiff suing over breaches of representations and warranties made in a $630 million purchase of well-service companies;
  • an electric power, oil and gas, and telecommunications infrastructure company in a lawsuit involving alleged breaches of covenants not to compete concerning a $300 million sale of telecommunications companies;
  • a fertilizer manufacturer in mass tort litigation involving the explosion of a retail fertilizer facility near Waco, Texas;
  • a medical devices company in global Foreign Corrupt Practices Act investigations involving the Department of Justice, Securities and Exchange Commission (SEC), and foreign government anti-corruption agencies;
  • a hardware company in an internal investigation related to a loss of approximately $150 million; companies, directors and bankers in shareholder class action suits challenging multimillion- and multibillion-dollar corporate mergers;
  • multiple entities in federal securities and breach of commercial contract cases; and clients on the risks involved in executing business strategies.

Mr. Mayerfeld’s pro bono work has included:

  • securing the release of a man who spent 28 years in prison after being convicted wrongfully of arson and four counts of murder at the age of 16, based solely on a coerced confession;
  • representing a client seeking asylum who was persecuted in El Salvador due to his sexual orientation; and
  • assisting a client seeking asylum who was facing forced marriage in Sudan and persecution due to religious beliefs.



  • J.D., IIT/Chicago-Kent College of Law, 2003
  • B.S., Northern Arizona University, 1999


  • Illinois
  • New York
  • Texas
  • U.S. District Courts for the Northern, Eastern, Western and Southern Districts of Texas and Northern District of Illinois
  • U.S. Court of Appeals for the Fifth Circuit


  • Member, Steering Committee for Food, Houston Food Bank
  • Chairman, Board of Directors, Project WOW

Daniel S. Mayerfeld

Counsel, Complex Litigation and Trials