Pelham PLLC

Built on Integrity, Driven by Strategy, and Committed to Every Client Globally

We have built a reputation on unwavering integrity, strategic thinking, and a global perspective, ensuring every legal challenge is met with clarity, precision, and a commitment to the best path forward.
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Diana Pelham, Esq.

Founder & Principal Attorney

Meet the Legal Strategist Behind
Pelham PLLC

Every law firm has a foundation. Pelham PLLC is built upon the strong foundation of  Diana Pelham, an attorney known for her sharp legal mind, strategic thinking, and unwavering dedication to tax law and serving her clients. With an approach rooted in precision, integrity, and problem-solving, she has built a firm that reflects her commitment to excellence and client-first philosophy.

A Career Defined by Dedication

Diana’s journey in law was a calling. She spent years honing her expertise in tax, tackling complex federal, state, and international tax matters with a deep understanding of the law. Her ability to analyze intricate financial and regulatory challenges sets her apart as a leader in the field.

Her work is guided by a simple yet powerful principle: Tax law is not just about numbers; it is about people. Whether working with individuals or businesses, she takes the time to understand each client’s unique financial circumstances, ensuring that every legal strategy aligns with their long-term goals.

Education - A Foundation Built on Excellence

Diana’s academic background reflects her dedication to mastering tax law and financial regulations. She holds multiple advanced degrees, including:

  • Master of Laws (LL.M.) in Taxation, Boston University School of Law
  • Master of Laws (LL.M.) in International Banking Law and Finance (Magna Cum Laude), University of Edinburgh School of Law
  • Juris Doctor (J.D.), New England School of Law
  • Bachelor of Arts (B.A.) in Political Science (Cum Laude), San Jose State University

Her education, combined with real-world legal experience, has given her the tools to tackle even the most intricate tax disputes with confidence.

Beyond the Law: Community Involvement and Leadership

Beyond her legal practice, Diana regularly advises on emerging tax policies and compliance strategies, helping business and individuals navigate the evolving landscape of tax. She maintains a deep understanding of the complexities of ever-changing tax laws and policies by actively participating in leading tax seminars and closely monitoring the tax environment. Diana also actively contributes to the development of the tax law community through educational initiatives aimed at increasing public understanding of tax law.

A Commitment to Clarity and Advocacy

Tax law can be overwhelming. Diana makes it her mission to break down complex issues in a way that makes sense for her clients. Her approach to research, case preparation, and advocacy ensures that every legal decision is made with clarity and confidence. She does not just react to legal challenges; instead, she anticipates them, develops strategies, and identifies the most effective course of action.

Bar and Court Admissions — The Authority to Represent, The Experience to Lead

Diana is admitted to practice law in:

  • District of Columbia
  • New York
  • Texas
  • Wyoming
  • U.S. Tax Court

Professional Affiliations 

Diana stays at the forefront of tax law and legal advocacy through continuous engagement with the tax community.
  • Member, American Bar Association, Tax Section
  • Member, Federal Bar Association, Tax Section
  • Member, American Society of Tax Problem Solvers

Our Vision

Pelham PLLC aims to lead the field in tax dispute resolution and litigation, setting the standard for excellence in the legal industry. We strive to be recognized for our expertise, strategic approach, and legal innovation, continuously shaping the future of tax law. Our commitment is to build a lasting legacy of trust, advocacy, and success, ensuring clients receive the highest level of representation.

Our Mission

Pelham PLLC’s mission is to set the standard in tax law by tackling complex disputes with clarity, strategy, and unwavering dedication. We strive to protect our clients’ interests, uphold legal excellence, and navigate tax challenges with precision both in the U.S. and globally.

Our Core Values

Ethical and Transparent Representation

We provide honest and realistic assessments without overpromising or using scare tactics. Clients receive clear expectations and straightforward legal advice at every stage.

Strategic Legal Advocacy

We take a results-focused approach, crafting strong legal arguments that challenge IRS actions while prioritizing compliance and legal precision.

Precision and Legal Excellence

Every case is meticulously researched, ensuring that tax codes, statutes, and procedural steps are leveraged effectively.

Client-Centered Approach

We build custom legal strategies tailored to each client’s financial situation and long-term goals.

Proactive Problem-Solving

Rather than reacting to IRS actions, we anticipate tax challenges and develop solutions to protect clients before issues escalate.

Areas of Focus

Civil and Criminal Tax Controversy & Litigation

Civil and Criminal Tax Controversy & Litigation

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International Tax

International Tax

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International Tax Controversy

International Tax Controversy

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Choose Diana for Your Strongest Tax Defense

Expertise in Complex Tax Law


Specialize in high-stakes tax matters, including IRS audits, tax investigations, and payroll tax disputes.

IRS Dispute Resolution and Negotiation

Our firm anticipates IRS tactics and structures legal responses to resolve tax disputes efficiently and favorably.

Cross-Border and International Tax Solutions

For clients with multinational tax concerns, we provide expert guidance on a range of issues, including cross-border real estate investment corporate structures and cross-border business operations.

Direct Attorney Involvement

Unlike large firms where cases are passed off, Diana personally oversees every case, ensuring clients receive tailored legal representation and strategic counsel.

Pelham PLLC: More Than a Law Firm

A law firm is only as strong as the values it upholds. Pelham PLLC is more than a legal practice; it is a firm built on trust, advocacy, and a relentless pursuit of justice. Every case is handled with the same dedication and meticulous attention to detail that defines Diana’s approach to the law.
At Pelham PLLC, clients don’t just get legal representation; instead, they get a dedicated partner who is deeply invested in protecting their financial future.
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