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Katherine Rose Siegfried

Social Security & Disability Attorney at Oakland, CA

5.0   13 reviews
  • State Years
    California - CA 16 years
    Hawaii - HI 19 years
  • Licensed for 16 years
    State CA
    Acquired 2007
    Active No misconduct found
  • Licensed for 19 years
    State HI
    Acquired 2004
    Suspended - Administrative No misconduct found

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

About Katherine

Learn Katherine’s areas of practice.

Practice areas
  1. Social Security & Disability
    All levels of appeals.

    11 years

  2. Appeals
    Federal court appeals of Social Security matters, as well as state court appeals of administrative hearing decisions.

    11 years

  3. Education
    Representing children who have been denied Special Education services.

    11 years


Law Office of Katherine Siegfried
1939 Harrison St
Suite 120
Oakland, CA, 94612-3461

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5.0 / 5.0
  13 customer reviews
5 Star
4 Star
3 Star
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1 Star
Posted by Jeanett | September 30, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Katherine and her team are exceptional. She never gave up after two appeals, she continue with my SSD case and finally we won. I recommend Katharine Siegfried for anyone. Excellent Attorney.
Posted by kal | July 15, 2023
This review is from a person who hired this attorney.
| Hired Attorney
great experience
This attorney was kind and knowledgeable. She was able to provide me with a lot of help. Based on my experience with her office, I do recommend her to anyone, who needs help with social security and Disability.
Posted by Arman for Ralf | April 14, 2023
This review is from a person who hired this attorney.
| Hired Attorney
The Best SSA Attorney
No doubt about her expertise when it comes to Social Security Disabilty or SSI denied claims. She did it right the first time. Thank you very much Atty Siegfried for helping Ralf.
Posted by Melissa | July 1, 2021
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
The best!
Katherine and her team are the absolute definition of informed compassionate representation. Her experience and well known ethic works within the system as well as professional with a top notch support staff, it just does not get any better. She can wade through the red tape and SSI Disability system like no other. I highly recommend the Law Offices of Katharine Siegfried to anyone needing this type of representation. In my opinion, this is the best choice.
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Posted by John | December 16, 2020
This review is from a person who hired this attorney.
| Hired Attorney
The only attorney that would take my case!
Attorney Siegfried, as well as the staff was exceptional in dealing with my case. After being denied my SSDI since 2015, as appeal after appeal was denied, Attorney Siegfried took my case to a Federal Appeals when no other attorney would make time for me; most would say there is nothing here or that there was NO chance at the Federal level. The other attorney's were wrong! We WON!!! Thank you for helping me as well as walking me through this during difficult times.
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Posted by Jmk | May 5, 2020
This review is from a person who hired this attorney.
| Hired Attorney
There for the long haul
Katherine Siegfried has stood by my side for over 8 years while fighting for my disability rights. She never gave up on my case and always had a clear view of where we were headed despite the long road. Her tenacity professionalism and compassion won my cases, I recommend her highly for those reasons.
Posted by Joyce | February 27, 2018
This review is from a person who hired this attorney.
| Hired Attorney
She handle my case with such understanding and she has such of a calm spirit. I would recommend Ms. Siegfried to anyone.
Posted by anonymous | February 8, 2018
This review is from a person who hired this attorney.
| Hired Attorney
She is 1 in a million
Ms.Siegfried is one in a million. I have never met such an honorable person, yet alone an attorney who fought my case side by side with me. I was never left in the dark about my case. You can caste your fears aside and trust that she will be there every step of the way. She answers your questions you have thoroughly and her response times are unbelievably quick. She was there for me when no one else was. She didn't give up on me when I wanted to give up on myself. I am forever grateful to have worked with Ms.Siegfried. You will be in good hands every step of the way. She is literally Super Woman in disguise. Thank You Ms.Siegfried for reinstating my faith in humanity.
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Posted by F Cori | September 21, 2017
This review is from a person who hired this attorney.
| Hired Attorney
She is the VERY BEST!!!!
My case started back in 2010....Kat NEVER gave up, she fought for me EVERY step of the way. On top of having to deal with a Judge that didn't want her to get paid for the OUTSTANDING work she had done with my case. If you TRULY want someone that will fight for your rights, look no further for she is the VERY BEST!!!! Again from the bottom of my heart, Kat THANK YOU SO MUCH.
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Posted by Veronique | June 6, 2017
This review is from a person who hired this attorney.
| Hired Attorney
A great Attorney
For years I battled to get SSDI. I suffer from a rare condition that most specialists won't touch with a 10-ft pole, it's been difficult to get them to say (or do) anything about my case. In addition, because of the "pre-existing" condition (was born with it), I couldn't afford the $14,400 yearly Cobra health insurance and thus had not been able to develop doctor-patient relationships, I couldn't even afford the regular tests or some of the medications I was prescribed. That is where Ms. Siegfried was exceptional. She was very patient given the absence of medical reports from my own doctors (including one who purged my file); and researched my problem until she understood it well enough to convey my frustration. A remarkable feat that even my doctors have not attempted to perform. Thanks to Ms. Siegfried, I now have SSDI. Thank you Katherine Siegfried!
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Posted by sequoialdrew | August 14, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Five Star Attorney!
I highly recommend Katherine Siegfried. For years I had been denied Social Security benefits. From 2010 to 2014 I contacted over two dozen attorneys and law firms. After explaining my situation to them, they ALL refused to represent me because they said I was too young to be approved for social security, it would be hard to prove it to the judge because of my age,I didn't have enough medical evidence, and they were sure it would be hard for me to win. That's when I contacted Ms. Siegfried in July 2014 and explained my case to her. What set her aside from other attorneys was that SHE TRIED! How can you know if you're going to win a case unless you try? Katherine's one of those attorneys where she actually cares about fighting for her clients rights and not just how much money she can make on my case. She believed in me, fought for me, and did not give up on me. What I admire most is that Katherine took a chance on my case. I felt like she was the only person to listen to me. Katherine fought my case until she WON it! She's a beast in the courtroom, very professional and has excellent communication skills. You are much appreciated. Thank you for everything!
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Posted by Michael | April 7, 2014
Social Security Disability Success Story
I would not hesitate to recommend Katherine Siegfried to anyone seeking a qualified attorney to represent them in a Social Security Disability case. I interviewed three potential candidates and selected Katherine because of her knowledge and ability to answer all of the questions I had concerning the claim filing process. During my initial attorney selection phone interview with her she was very pleasant and I never felt rushed. We spent well over an hour on the phone interview and afterwards I immediately decided that she was the attorney I wanted to represent me. She directed me to all of the information that would be needed to file my claim and was able to quickly answer any and all questions that I asked her on the phone and through e-mail correspondence. With her assistance, my Social Security Disability Claim was approved in less than 1-1/2 months from the time it was submitted. I credit the expedience of my claim to her knowledge of what information was necessary, and attention to detail in the step by step process of filing my claim. I went from thinking at the beginning of this process that I might not qualify, to having my claim approved and having my first month's Social Security Disability Claim payment electronically deposited into my bank account in a matter of just 39 days! She was a joy to work with and I would absolutely recommend her!
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Posted by anonymous | February 3, 2014
Excellent Attorney to Solve Difficult Cases
My SSI benefit was stopped in 9/2013,and the next month I received an overpayment letter from SSA in which I have to repay them a large amount of money. I start looking for an attorney and the first three attorneys I spoke or met with they all refused to accept my case giving me different excuses. Finally my quest for an attorney led me to the Law Office of Ms. Katherine Siegfried. In our first meeting in 11/2013 Ms.Siegfried showed an appreciable understanding of my case and a decent follow up with SSA after that, keeping me fully informed about my case progress.In 1/2014 my SSI problem was solved and the overpayment was canceled and I started receiving my SSI benefit again . Three words to describe the Law Office of Ms. Katherine Siegfried : Compassion, Dedication and Excellence. I strongly recommend the Law Office of Ms. Katherine Siegfried to anyone who has any Social Security issues.
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  • Contingency 25%-25%


AVVO RATING 7.5 (Very Good)

Work Experience

  • Staff Attorney
  • Bay Area Legal Aid
  • 2007 - 2013
  • Supervising Attorney
  • Legal Aid Society Of Hawaii
  • 2004 - 2007


  • New York University School of Law
  • Juris Doctorate
  • 2004
  • Bard College
  • BA - Bachelor of Arts
  • 2000

Sample of Legal Cases

  • Young v. Berryhill
  • Remand in District Court on the basis that SSA did not properly account for symptoms testimony.
  • Xie v. Colvin, Case No. 14-cv-02325-JCS (N.D. Cal. Sep. 18, 2015)
  • Won substantial award of disability benefits for an individual with a remote onset date.
  • Lugo v. Contra Costa County Board of Supervisors
  • As a result of our settlement, the program underwent significant positive changes.


  • National Organization of Social Security Claimants Representatives
  • Attorney Member
  • 2013 - Present

Languages Spoken

  • English
  • Spanish


Speaking Engagements

  • Circuit 9 Conference
  • SSI Benefits for Children
  • 2020

Attorney endorsements

Received (0)
Given (5)
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