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Sean J. Slattery, FSA, MAAA

Consulting Actuary
Seattle, WA, US

Tel: +1 206 5045938

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Professional Designations

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


  • BA (cum laude), Economics and Political Science – University of California, San Diego

Current Responsibility

Sean Slattery is a consulting actuary specializing in healthcare consulting in the Seattle office of Milliman. He joined the firm in 2009.


Sean assists clients with a variety of projects, many focused on managed care, Medicare Advantage, low-income populations, behavioral health, prescription drugs, and healthcare payment reform. Examples of the work that Sean does include:

  • Medicare Advantage bid development, feasibility studies, and benchmarking (Parts C and D) with a focus on low-income populations and plans launching in new markets
  • Projections of Veteran enrollment for the Department of Veterans Affairs
  • Behavioral healthcare pricing and benchmarking for Medicaid and Commercial populations
  • Milliman Health Cost Guidelines (HCG) research
  • Utilization benchmarking for provider-owned healthcare delivery systems across Commercial, Medicare, Medicaid, and uninsured populations
  • Support for provider-owned Accountable Care Organizations (ACOs) in contracting, especially in the Medicare Advantage market
  • Work at Milliman

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