Who We are

About Us

Phillip Mixon, CPA/JD

Managing Attorney

When it comes to navigating the complex world of tax law, having an experienced and knowledgeable advocate by your side can make all the difference. Phillip Mixon is a seasoned tax attorney who brings a wealth of expertise and a robust professional background to the table, ensuring that his clients receive top-notch representation in all tax-related matters.

Phillip Mixon is not just a tax attorney; he is also a Certified Public Accountant (CPA), a dual qualification that sets him apart in the field of tax law. Holding both his CPA license and Texas bar license, Phillip offers a unique blend of legal and financial acumen that benefits his clients in multifaceted ways.

Phillip’s career began at KPMG, one of the Big Four accounting firms, where he honed his skills in the Mergers and Acquisitions (M&A) tax department. At KPMG, Phillip played a pivotal role in advising clients on the tax implications of corporate transactions, ensuring compliance and optimizing tax outcomes during high-stakes deals. His experience at KPMG provided him with invaluable insights into the complexities of tax law and corporate finance, which he now leverages in his current practice.

Today, Phillip Mixon focuses his practice on IRS and state tax controversy matters. His extensive background enables him to expertly handle disputes with taxing authorities, providing strategic advice and representation to individuals and businesses facing audits, assessments, and other tax-related challenges. Whether it’s negotiating with the IRS, contesting state tax determinations, or navigating complex tax regulations, Phillip’s clients can trust that they are in capable hands.

Our Staff

Ashley Acosta

Managing Attorney

Ashley Acosta is a dynamic and driven student at the C. T. Bauer College of Business, University of Houston, where she is pursuing a Bachelor of Business Administration in Finance and Marketing, with an expected graduation in May 2026. With a strong academic foundation, she has consistently demonstrated her commitment to excellence and leadership, earning recognition on the Dean’s List in Fall 2022 and Fall 2023.

Ashley is actively involved in various academic projects, showcasing her collaborative and analytical skills. In Fall 2023, she worked on a sponsored project for FORVIS as part of her BUSI 3302: Connecting Bauer to Business course. Leading a team of eight, she conducted extensive research to enhance FORVIS’s social media presence, focusing on identifying platforms that would attract both clients and potential employees. She spearheaded the research efforts, ensuring accuracy and timeliness, and played a crucial role in presenting the results to the FORVIS Houston office. In addition, Ashley has developed her professional selling skills through a Dell Technologies Sales Roleplay project in her MARK 3337: Professional Selling class, where she worked alongside her team to compose a comprehensive business proposal. She demonstrated strong communication and negotiation abilities, role-playing as a Dell Technologies sales representative, and effectively engaged with the University of Houston IT department.

Professionally, Ashley has gained valuable experience as an Accounting Intern at Mixon Tax Law since August 2024. Her responsibilities include preparing tax returns, providing administrative support, and assisting with property tax litigation. She also drafts and files company formation documents, honing her organizational and legal skills in a fast-paced environment.

Practice Areas

Mixon Tax Law handles cases involving many tax-related issues including: