Meet our Attorneys
Family Law & Disability Law Firm


CEO and Founding Partner

Matt is a proud husband and father of three boys and a little girl. He attended Florida State University where he graduated magna cum laude and went on to attend the Florida State University College of Law. In Law School, he was Chief Justice of the Student Supreme Court and a member of the school’s highly decorated Mock Trial Team. Matt continued his involvement with the FSU College of Law as a coach for the school’s Mock Trial Team, coaching the school’s 2012 state championship trial team. From 2015 to 2018, Matt served as the President of the National Alliance on Mental Illness (NAMI-Tallahassee). The firm has been a sustaining sponsor of NAMI’s annual Blue Bird Run for Brookie B since the inaugural run, donating and raising tens of thousands of dollars for local suicide prevention programs.

Let's Work Together

My Big Why… My dad suffered his first heart attack while I was in law school at Florida State University. All of a sudden, my plans to move back to South Florida changed. I knew I needed to be near my parents who were living in Atlanta at the time. My dad was one of the lucky ones who survived his heart attack. But his physical health was slowed down and I wanted to spend time near him to help him and my mom. After working as a security guard for many years, Dad was unable to do the work he had done in the past. Without his SSI and the Medicaid that came with it, dad would have been unable to afford the medications that kept him alive. I know on a very personal level how important it is to my clients and their families that they receive the benefits they deserve. That’s why I love what I do and why it’s important to me that my office treats my clients with the kindness and respect they deserve.

As far back as I can remember… My sister always struggled with challenges that other people didn’t have. She is learning disabled and she wasn’t able to hold a full time job because of the challenges she faced. As her big brother, I always looked out for her and helped her through the many obstacles she’s had to deal with in life. Now as a social security disability attorney, I get to help people like my sister, good people who have conditions most of us pray we never have to deal with. My relationship with Natalie has made me the person I am today, a disability attorney who cares deeply about his clients well being. A disability attorney who treats his clients with the same respect he’d want his sister to be shown.

At my office, every client is treated like a member of our family. They are treated with dignity and respect no matter the challenges they and their families are dealing with. That is what makes us unique. And it’s why we hope you’ll consider us when you or someone you know needs social security disability (SSDI), supplemental security income (SSI) or private disability insurance.


Partner and Director of Family Law Practice

Bryan was born and raised in Miami, Florida. He attended the University of Florida, where he graduated with a Bachelor of Science in Sports Management and Minors in Business Administration and Entrepreneurship. He went on to attend Florida International University College of Law, where he graduated with the Law Merit Scholarship, on the Dean’s List, and as a Certified Florida County Court Mediator.
During Law School, Bryan interned for the Honorable Judge Abby Cynamon in the Eleventh Judicial Circuit of Florida. He also gained crucial legal experience while clerking for Buckner, Shifrin, Etter, Dugan, Bradfute & Kohlman, P.A. and Leinoff & Lemos, P.A. in Miami. In 2016, Bryan moved to Tallahassee and continued his legal career with Liebenhaut Law.

Bryan is a licensed member of the Florida Bar, trained in Collaborative Family Law, and exclusively practices Family Law. He assists individuals by alleviating the suffering, confusion, and stress that can occur during family law matters. Bryan spends his free time with his wife, Mallory, and their three rescue dogs. He enjoys watching sports, movies, and TV shows, spending time with family and friends, and attending Florida Gators football, basketball, and baseball games.

Gabriella Hernandez

Partner, Social Security Disability Law

Gaby was born and raised in Southwest Florida. She attended Florida State University, where she graduated with a Bachelor of Science in Environmental Science. She continued her studies and graduated from the Florida State University College of Law.

Gaby is a specialist in the field of Social Security Disability, devoting 100% of her practice to cases before the Social Security Administration.  She has represented over 1,000 Social Security Disability claimants. In her time with the firm, Gaby has developed a reputation for excellent legal work and conscientious client service.  She has won hundreds of disability cases before Administrative Law Judges throughout Florida and Georgia.

Gaby enjoys to spend her free time with family and friends, hiking, reading, and attending Florida State Football, Baseball, and Softball games.

Austin Mutnansky

Associate Attorney, Family Law

Austin was born and raised in Seminole, Florida. Prior to joining Liebenhaut | Hesser, he served as judicial intern for , Chief Justice of the Florida Supreme Court. Austin graduated from the Florida State University College of Law where he gained valuable experience representing family law clients through the school’s Public Interest Law Center and served as Vice President of the Health Law Society and an editor of the FSU Business Law Review.  When he’s not working, he enjoys the outdoors and finding new trails and parks to take his dog, Jolene.

Austin is a star member of our family law team because of his dedication to our clients and their families.  “Every day, I get to learn about our clients’ life stories.  They’re often filled with challenges and obstacles, battles and heartbreak.  And the best part of my job is getting to know our clients and getting to see how our work can make that heartbreak a bit less painful and those challenges a lot less difficult.”

Kayla Sizemore

Associate Pending Bar Admission, Social Security Disability Law

Kayla worked in Human Resources for two years after graduating with High Distinction from Florida State College in Jacksonville.   She continued her studies at the Florida State University where she graduated magna cum laude before attending law school.  During her time at the FSU College of Law, Kayla served as a Judicial Extern, Research Assistant and as an FSU Law Student Ambassador.  She began with Liebenhaut Hesser immediately after graduating law school in 2023.