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Stephen J. Koca, FCAS, MAAA

Principal, Consulting Actuary
Pasadena, CA, US

Tel: +1 626 5771144

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Professional Designations

  • Fellow, Casualty Actuarial Society
  • Member, American Academy of Actuaries


  • BS, Mathematics, Pennsylvania State University

Current Responsibility

Stephen is a principal and consulting actuary with the Los Angeles office of Milliman. He joined the firm in 2005.


Prior to joining Milliman, Stephen worked for a leading nationwide physician medical professional liability carrier.

Stephen's primary areas of expertise include workers' compensation and professional liability unpaid claim analyses for self-insureds. He also has significant experience in all areas of medical professional liability actuarial consulting services for traditional insurers, risk retention groups, captives, and self-insureds. His expertise also includes the evaluation of excess or reinsurance layers of loss and the evaluation of reinsurance contracts. Stephen has been involved in a broad range of actuarial services and his experience includes many property and liability lines of business beyond his expertise in medical professional liability and workers' compensation.


  • American Academy of Actuaries, Workers' Compensation Subcommittee
  • American Academy of Actuaries, Casualty Practice Council
  • Casualty Actuarial Society, Loss Simulation Working Party (2007-2010)
  • Work at Milliman

    • “I was offered a chance to come in, shake things up, create something."
    Work at Milliman