Skip to main content

Mateo Caballero

Civil rights Attorney at Honolulu, HI

5.0   2 reviews

About Mateo

Learn Mateo’s areas of practice.

After graduating from Harvard Law School in 2007, Mateo worked for five years in Washington, D.C. at the nationally recognized law firm of Covington and Burling. During that time, Mateo practiced tax law and conducted internal investigations of large publicly-traded corporations, while at the same time taking on significant pro bono cases ranging from representing indigent defendants in landlord-tenant court to filing a clemency petition on behalf of a mentally disabled person on death row in Virginia. In 2008 at the height of the financial crisis (between his time at Covington), Mateo also clerked for Judge Elizabeth S. Stong at the U.S. Bankruptcy Court in the Eastern District in New York in Brooklyn.

Starting in 2013, Mateo worked for over three years at a premier Hawaiʻi law firm doing litigation, internal investigations, real estate, and multi-million transactional work. In September 2016, Mateo became Legal Director at the American Civil Liberties Union of Hawaiʻi, where he managed their impact litigation docket on a wide range of civil rights and liberties issues, including free speech, disability rights, privacy and technology, due process, and equal protection. At the ACLU, Mateo defended and advanced the civil rights and liberties of everyone in Hawaiʻi, but particularly of those most marginalized by the legal system and society. Mateo is also a lecturer on civil rights and liberties at the University of Hawaiʻi at Mānoa at the William S. Richardson School of Law. After four and a half years, Mateo left the ACLU to launch Caballero Law to marry his expertise in civil rights and liberties with his passion for justice and for helping others through complex legal problems.

Photos and videos

Licensed for 14 years
State HI
Status Active
Acquired 2014
Updated 11/22/2022
State DC
Status Good Standing
Acquired 2010
Updated 06/08/2022
State NY
Status Currently Registered
Acquired 2008
Updated 06/05/2022

We have not found any instances of professional misconduct for this lawyer.

Contact Mateo

Caballero Law LLLC
P.O. Box 235052
Honolulu, HI, 96823


5.0 / 5.0
  2 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by Graham | February 12, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Treats your case like it is HIS case...
I have known Mr. Caballero for several years, and he has impressed me with his dedication, timeliness, and savvy legal knowledge. He took his time with me, explained the process and next steps well, and helped me understand what was going on, and that was really important to me.
Posted by Fadhl | February 9, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Mateo changed my life
2016 was hard for me as I can not bring my family because of the travel ban from Trump administrative for Muslim countries. I was hopeless and did not know what to do. I called Mateo while he still working with ACLU. I knew Mateo for more than six years and I did not see one person like him as a human and a professional lawyer in my whole life. Mateo will take of many things and his communications skills is outstanding. You do not have to think about your case if you hire Mateo as he will take care of small details. Every night I think about how Mateo bring my family back and thanks God for sending him to save my life. Mateo is my best example on how the person should be human before he practice his profession. I advise anyone to hire Mateo and you will thank me for this great advice.
Read less


  • Free Consultation 30 minutes
Payment methods
Cash, Check


AVVO RATING 8.1 (Excellent)

Work Experience

  • Principal Attorney
  • Caballero Law LLLC
  • 2021 - Present
  • Legal Director
  • ACLU of Hawaiʻi
  • 2016 - 2021
  • Senior Counsel
  • Starn O'Toole Marcus & Fisher
  • 2013 - 2016
  • Associate
  • Covington & Burling
  • 2009 - 2013
  • Law clerk
  • U.S. Bankruptcy Court, E.D.N.Y.
  • 2008 - 2009
  • Associate
  • Covington & Burling
  • 2007 - 2008
View all work experience


  • Harvard Law School
  • Juris Doctor cum laude
  • 2007
  • Washington and Lee University
  • Bachelor of Science, summa cum laude
  • 2004

Legal Cases

  • In re K.M., FC-S No. 14-1-0159
  • Family court issued an order allowing hormone therapy treatment for client


  • American Judicature Society
  • Member
  • 2020 - Present
  • Federal Bar Association
  • Member
  • 2016 - Present
  • Hawaiʻi State Bar Association
  • Member
  • 2014 - Present

Languages Spoken

  • Spanish


  • Hawaiʻi Access to Justice Room Individual Award
  • Hawaii Access to Justice Commission
  • 2017


  • International Energy Law and Taxation Review
  • Transfer Pricing - Recent U.S. Case Law Developments
  • 2010

Speaking Engagements

  • Reproductive rights in Hawaiʻi
  • Civil rights
  • 2019
View all speaking engagements

Attorney endorsements

Received (0)
Given (0)
Endorsements from fellow lawyers are an important consideration for many when selecting the right attorney.
This attorney hasn't created any attorney endorsements recently on Avvo.

Avvo Contributions

This attorney hasn't created any legal answers in Q&A or legal guides recently on Avvo.

Honolulu Civil rights Lawyer Mateo Caballero
Mateo Caballero
Civil rights Attorney
Honolulu, HI
Licensed for 14 years
Free Consultation