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Derek M. Diemer

Derek Diemer joined Thompson and Colegate LLP as an Associate in 2024. Prior to Thompson and Colegate LLP, Derek worked as an Associate at a boutique law firm based out of Riverside and Palm Springs, CA, with a focus on Tax Law, Probate, Trust and Estates, and Elder Law.

While in law school, Derek served as the Executive Lead Articles Editor and Executive Notes & Comments Editors for the California Western Law Review, a Research Assistant to Professor Nancy Kim, an Honor's Instructor for Legal Research and Writing, Vice President of Phi Alpha Delta, Secretary of the Environmental Law Association, and as a Student Attorney for the Low Income Tax Clinic of the Legal Aid Society of San Diego.


  • Outstanding Service Award -- Legal Aid Society of San Diego, Inc.
  • Award for Academic Excellence -- Advanced Contracts: Theory and Application.


  • "Destroying Ourselves: Is it Time to Find an Alternative to the Gas Tax?," California Western Law Review: Vol. 57: Iss. 1, Article 12.
    Available at:
  • "Hiding Actualities: Whether Art Should Exist Independent of the Artist," American University Intellectual Property Brief: Vol. 11: Iss. 2.
  • "Fighting Giants: Using Standard Form Contracts to Protect the Industry Outsider,"Taylor & Francis: Information & Communications Technology Law.

Professional Affiliations:

  • Riverside County Bar Association
  • Riverside County Barristers
  • San Bernardino County Bar Association
  • Desert Bar Association
  • Los Angeles County Bar Association
  • Beverly Hills Bar Association


  • JD, California Western School of Law, San Diego, Business Law Concentration with Honors, 2021
  • BA, California Polytechnic State University, San Luis Obispo, Philosophy with a Concentration in Ethics and Society, 2018

Bar Admissions:

  • California, 2022
  • U.S. District Court, California, 2023 (Central, Southern, and Northern Divisions)
  • U.S. Tax Court, 2023

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