Houman Ehsan


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Houman Ehsan holds a JD, MD, and an MBA, a combination that allows him to focus his practice on the nexus of medicine, business, and the law. As an attorney–physician, he provides clients with legal and factual analysis of complex medical and scientific issues arising from products liability and healthcare litigation defense, healthcare due diligence, and healthcare financial arrangements. He has extensive experience working with expert witnesses in both products liability and general healthcare litigation settings. And within O’Melveny, Houman himself is recognized as an in-house expert, called on to translate the intricacies of the healthcare and life-sciences industries into practical advice for fellow litigators.

He counsels clients ranging from biopharmaceutical, to managed health care, to technology companies through deposition and litigation strategies.


  • Farsi


Bar Admissions

  • California

Court Admissions

  • US District Court, Central District of California


  • University of Southern California, J.D.: Order of the Coif
  • University of Southern California, Marshall School of Business, M.B.A.: Beta Gamma Sigma
  • University of Washington Affiliated Hospitals, post-graduate training in Internal Medicine
  • University of California at San Diego, M.D.
  • University of California at Berkeley, B.A., Molecular and Cell Biology/Neurobiology: Phi Beta Kappa

Professional Activities


  • “Attributable Risk And Specific Causation,” Law360 (November 2008)
  • Leading the identification, selection, and preparation of dozens of medical and scientific experts for pharmaceutical clients facing mass torts in state and federal courts
  • Coordinating preparation, deposition, and motion practice challenging opposing experts’ opinions under California and federal law on behalf of pharmaceutical clients
  • Providing a tutorial to the bench on the key scientific concepts underlying mass torts cases in both state and federal courts during various “Science Day” presentations
  • Providing case-specific causation analysis for multiple major pharmaceutical companies in products liability actions in numerous federal and state courts
  • Performing internal investigation and risk assessment on behalf of large healthcare providers