Firm Overview

Attorney Katherine Siegfried has over ten years of experience representing individuals with disabilities in administrative hearings and appeals. She has worked with clients on initial applications for disability benefits through federal court appeals.


Ms. Siegfried also handles special education appeals throughout the Bay Area for children of all ages and types of disabilities. 

She personally oversees each case, and works closely with clients to ensure that they gain a better understanding of the appeal process and of the merits of their case. 

Pursuing Social Security Disability benefits, or trying to get the services your child needs through special education, is stressful and time-consuming. You don't need to do it alone. 

When the Law Office of Katherine Siegfried represents you, we take on the burden of fighting for your rights, letting you have some peace of mind. 

In most cases, you will never have to pay anything up front to have an attorney handle your case. So don't wait. Call or email for a free consultation. 

We handle applications for Social Security Disability Insurance/Supplemental Security Income (SSDI/SSI) cases from application through federal district court appeals. We also represent children who have been denied special education services or are not getting the special education help they need. 

Our office is fully ADA accessible and is one block from the 19th St Oakland BART station.  Our firm is generally open from 9am until 5pm Monday through Friday, but some evening and weekend appointments are also available by request.

Initial Consultation?

Firm Specialties 

Social Security


Representing individuals and families with SSDI and SSI claims. Also representing children with special education cases.


Our firm is dedicated to pursuing the rights of individuals with mental and physical disabilities with compassion and expertise.


Firm Philosophy 

Katherine Siegfried worked for many years as a civil rights attorney, with a focus on individuals with disabilities, at Bay Area Legal Aid and the Legal Aid Society of Hawai'i. Her interest in pursuing justice for those caught in the bureaucratic system of the Social Security Administration developed from her own family's experiences with the struggles of a disabled family member. 

She has also represented families in filing and mediating due process complaints in special education cases throughout the Bay Area. As the daughter of a public school teacher, Katherine Siegfried believes strongly in the power of a good public education. Pursuing special education cases is a way for her to help ensure that children with special needs are given a chance at accessing that power.


Katherine Siegfried graduated from New York University School of Law. While there, she worked at the Immigrant Rights Clinic and interned at the Legal Aid Society of New York's Health Law Unit. 

She is a member in good standing of NOSSCR (National Association of Social Security Claims Representatives), COPAA (Council of Parents, Attorneys and Advocates) and the American Bar Association. 

Ms. Siegfried also frequently provides pro bono assistance to legal aid clients as well as mentorship and training to young attorneys starting out in this field of law.

What distinguishes your law firm from others?

We believe in working closely with our clients. If you hire us, you'll find yourself being treated with the utmost respect and being listened to with compassion. 

If your attorney can't understand who you are as a person, how will your attorney get the judge to understand you? We will meet with you and talk to you over the phone or email as much as it takes to come to that level of trust and understanding. 

You usually only get one chance to make an impression with the judge in your case. You want to be sure that you are represented by someone who not only cares about the outcome of your case, but who knows you and your background inside out. 

At the Law Office of Katherine Siegfried, we make sure we do just that, each and every time.

How Much Will I Pay?
SSDI and SSI cases are handled on a contingency fee basis, meaning you don't pay anything unless you win. Social Security must approve all fees and has a set amount that can be charged. It is currently set at a maximum of 25% of any past-due benefits.
Many special education cases can also be taken on a contingency basis and if you win or settle your case, you may be able to get those fees paid for by the other side. 

My Biography 

Katherine Siegfried

I grew up in a large family in a small town in New England. From a very young age I found myself angry about the injustices in the world, and wanting to do my part to help right them. To that end, I worked hard to put myself through law school and went on to work at non-profit legal services organizations. I now run my own law firm devoted to protecting the rights of individuals with severe mental and physical limitations. It is challenging, but deeply rewarding work. I look forward to coming to my office and find that the connections I form with my clients are the best part of my day. I cannot guarantee that I will win your case, but I can promise that I will give your case the care and attention it deserves.


Bar Number: 250558 
California, 2007


Bard College 

BA- Sociology, 2000 

Received highest honors for Sociology.


New York University School of Law 

JD, 2004 

Worked at the Immigrant Rights Clinic. Interned at Legal Aid Society of New York's Health Law Unit. President of the Public Interest Law Foundation. Elected Student Representative for the Public Interest Law Program.

  • Grey LinkedIn Icon
bio photo.jpeg

Mika Aoyama

Mika is a legal advocate with extensive experience representing people with disabilities in appeals of SSI and SSDI denials, overpayments, and terminations. In addition to her experience as a Social Security advocate at the New York Legal Assistance Group, she has also worked as a paralegal at the ACLU’s Disability Rights Program and at Root & Rebound, a reentry advocacy organization. Her commitment to benefits access work began in college as a volunteer at the International Rescue Committee in Oakland, where she assisted recently arrived refugees to apply for Social Security numbers and various public benefits.


Mika is a San Francisco native. She holds a B.A. in Development Studies from UC Berkeley. 


Bernadette Blashill

Bernadette Blashill is a bilingual legal assistant at the Law Office of Katherine Siegfried. She graduated from the University of California, Berkeley in 2019 with a B.A. in Sociology with high honors, where she volunteered with Central American migrants seeking asylum. She is passionate about serving and advocating for people with mental and physical disabilities, and striving to ensure that every client feels supported through the difficult process of applying for Social Security disability benefits. In her free time, she loves to swing dance, play guitar, travel, and read.

Bio pic.jpg

Jacob Regier

Jacob is a legal assistant with experience interacting with the Social Security Administration on behalf of clients. While working as a legal advocate for the Bar Association of San Francisco’s Homeless Advocacy Project, Jacob assisted clients with disabilities to access Social Security disability benefits, along with working to help resolve a variety of other Social Security issues.


Jacob is working to complete a B.A. in Race and Resistance Studies from San Francisco State University.


Yasser Alwan

Yasser is a legal assistant with some experience in disability law and with the Social Security Administration. He was an intern in Ms. Siegfried's firm in 2017 while he was in college. Later, Yasser became a part-time legal assistant in 2020. He is interested in law and data.

Yasser graduated from UC Berkeley with a B.A. in Political Science in 2019.


Katherine Siegfried’s reviews

Contact Me

1939 Harrison, Suite #120

Oakland, CA 94612

Tel: (510) 465-0018

Success! Message received.


The Law Office of Katherine Siegfried provides comprehensive and compassionate legal services for individuals and families in the areas of disability benefits and special education law.



1939 Harrison St, Suite #120
Oakland, CA 94612

Phone         (510) 465-0018
Fax              (510) 217-3979