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Greg Dietzen, FCAS, MAAA

San Francisco, CA, US

Tel: +1 415 3943791

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Professional Designations

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


  • BS, Mathematics, United States Naval Academy
  • SM, Mechanical Engineering, Massachusetts Institute of Technology

Current Responsibility

Greg is an actuary with the Property and Casualty practice in Milliman’s San Francisco office. He joined the firm in 2015.


Greg’s areas of expertise include:

  • Rate and product development for private passenger automobile, homeowners, and private flood lines, including development of generalized linear models and incorporation of data from industry sources, competitors, and catastrophe models.
  • Rate adequacy analyses including on-leveling premium to current rates, calculating policyholder dislocation as a result of proposed rate changes, and calculating premium and coverage trends.
  • Preparing rate filings to facilitate efficient regulatory reviews.

Prior to joining Milliman, Greg was an actuary with GEICO, specializing in private passenger automobile ratemaking.

  • Work at Milliman

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