About Us - Experienced Family Law Advocates
Guided by Experience, Defined by Advocacy
The Law Offices of Tresa A. Sadler PLLC was founded in 2009 with a commitment to serving families in Mill Creek and throughout Washington. With more than 20 years of practicing family law and estate planning, Tresa A. Sadler has built a firm that blends attention with big-picture legal strategy.
Our philosophy is clear:
we are not your therapists, we are your advocates. Clients trust us to set realistic expectations while pursuing outcomes that protect their families, their futures, and their peace of mind.
A Closer Look at Who We Are
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A Personal Connection to Family Law
Tressa Sadler: "My upbringing was of a divorced child. My parents separated when I was about six years old. I got to experience a parent who was adversarial to the process, adversarial to spending time with the other parent. I was thrust into a long distance parenting arrangements. I would see my dad on the summers.
I know what it feels like to be that kid at the airport traveling. Having to have an airline flight attendant get you on and off the plane. And it has this effect on you as every time you get together, you're strangers and you need time to get to know each other all over again. That was one of those situations where I saw firsthand how divorce affects children."
Client Stories: Finding Support
Client Testimonial (Custody & Child Support): "I have a daughter and I was not married to her mother and I needed help with custodial battle with my daughter. I was scared and I didn't know what to do. I needed help. I realized I needed to hire an attorney when I just felt like I had no other option. I think it was my last resort. I found the law office of Tressa Sadler from a good friend of mine that referred me to her.
When I first came, we did was set up a parenting plan and we set up child support. I think family law is one of those things you got a lot of emotion involved and Tressa is always very professional. Interaction has been great with Tressa's law office. They're all of her help. I would definitely recommend Tressa Sadler. She's just always been there for me."
Client Testimonial (Divorce & Assets): "My brother was going through a divorce and he was in the process of looking for a lawyer. I think there were a lot of difficulties with his case and one of the biggest one is obviously his assets. It affected me personally because my brother and I are very, very close. I came to the right place and found Tressa.
We started talking and I explained to her the case and she said, 'I would love to help your brother. I feel like he deserves justice.' They were very transparent. They were very honest. She guided us through everything, helped calm us down through the entire process and made sure that it was fair and square."
Firm Philosophy & Mission
Tressa Sadler: "We are at a time that is so expansive as far as the recognition of needs of our children from a mental health perspective. And it is so rewarding that we have parents who recognize that their child has special needs. As a part of our firm, one of the things I really enjoy doing is finding what fits for a family to make sure that it is a good fit.
Our values as a firm are communication and great work. We really focus on making sure that clients feel like they are an integral part of making decisions in their case and making sure that they understand what's happening every step of the way.
The mission of the law offices of Tressa A. Sadler is to provide the best customer service we can with the utmost in compassion and integrity so that our clients feel supported in their daily lives. The law offices of Tressa A. Sadler, we provide a complete picture of a pathway through the most difficult times of your life so that when you reach the end, you are going to be supported and grounded."
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Dedicated Attorneys, Proven Credentials
Our attorneys bring unique experiences, academic achievements, and courtroom skill to every case. From seasoned advocates to rising legal talent, each member of our team is united by a focus on family law, estate planning, and probate.
Tresa Ann Sadler, Founder
Tresa Ann Sadler was born and raised in California. She graduated from the University of Washington with a degree in Mathematics. Following her undergraduate work, Tresa attended and graduated cum laude from Seattle University in 2001.
Tresa has been practicing in Family Law and Estate Planning since passing the Bar in 2002, after which joined Law of Offices of J. Michael Gallagher as an associate attorney. In 2009, she opened her firm, The Law Offices of Tresa A. Sadler. Tresa is also a member of the Domestic Relations Attorneys of Washington.
Katherine Peterson
Katherine Peterson received her undergraduate degree with honors from California Lutheran University. In 2006, she clerked for Mr. Leonard Kerr for four years as a Rule 6 Intern, which allowed her to sit for the Washington State Bar Exam in 2012. Ms. Peterson passed the bar exam on the first try. Following her admission, she continued to work as an attorney for Mr. Kerr, first for the firm Shipman & Uberti, PLLC, and then as a solo practitioner.
She happily accepted the opportunity to work for the Law Offices of Tresa A. Sadler, PLLC, which affords her a balanced life. She spends her winters at home in Arizona and the remainder of the year in Washington.
Katherine Czubakowski
Katherine Czubakowski graduated from Gettysburg College in Pennsylvania in 2017 with a double major in Public Policy and Music. She graduated from the University of Washington School of Law and became a member of the Washington State Bar Association in 2022. Katherine was also sworn into the Tulalip Tribal Court bar in 2022.
Katherine joined The Law Offices of Tresa A Sadler as a Rule 9 intern at the beginning of 2022 and transitioned to a Junior Associate Attorney upon passing the Washington bar.
Dylan Kittay
Dylan Kittay was born and raised in Bothell, Washington. He received his undergraduate degree from the University of Washington in 2021 and graduated from Gonzaga University School of Law in 2025. Dylan joined The Law Offices of Tresa A Sadler as a Rule 9 intern during the summer of 2024 and transitioned to a Junior Associate Attorney upon passing the Washington bar in 2025.
The Strength of an 18-Member Team
With 18 team members, our law firm delivers personal attention without losing efficiency. Every attorney is supported by skilled staff, ensuring that cases move forward with care and precision. Confidentiality, collaboration, and empathy are the foundation of how we work with families navigating difficult transitions.
Proudly Serving Mill Creek and Washington Families
Our attorneys are deeply rooted in the local community, representing clients in Mill Creek, Snohomish County, King County, and beyond. We are among the few firms with experience in Tulalip Tribal Court and bring specialized knowledge of QDROs to protect retirement assets in divorce. These unique qualifications distinguish our law office across Washington.
You Will Be Heard
Every client deserves to feel understood. At the Law Offices of Tresa A. Sadler PLLC, we take time to listen carefully and provide candid guidance about likely outcomes. Whether you’re facing a high-asset divorce, a custody dispute, or planning for your family’s future, our commitment is to clarity, compassion, and results.