Costello Law Firm, PLLC

If you are facing a white collar, government investigation, or a complex litigation matter, contact us.

We protect, guide, and partner with our clients in times of legal crisis to swiftly, confidently, and effectively resolve these matters. We take great pride in representing our clients powerfully and gracefully.

Costello Law Firm, PLLC
White Collar, Seattle

Practice Areas

White Collar Defense / Government & Grand Jury Investigations

CLF defends individuals and businesses during administrative, civil, and criminal white-collar government and grand jury investigations and litigation matters. CLF has decades of experience defending clients in the full range of white-collar matters, including, but not limited to, general fraud, health care, securities, cybersecurity, employment-related violations, immigration-related violations, tax, breach of fiduciary duties, false claims, kickbacks, and industry-specific regulatory and civil violations.

Professional Licensing Investigations & Actions

CLF defends professionals during professional licensing investigations and professional litigation matters. CLF has decades of experience assisting professionals navigate these stressful and high-stakes matters.

Complex Concurrent / Parallel Proceedings

CLF defends clients when white-collar allegations trigger multiple and simultaneous “parallel” civil, administrative, and criminal actions. CLF has decades of experience leading and managing these complex, high-stakes and high-risk matters and is highly effective in the strategic coordination needed to minimize exposure and secure the best possible outcome.

General Business and Employment Litigation & Dispute Resolution

CLF defends small business owners in business and employment disputes. CLF helps clients manage allegations of wage violations, harassment, privacy, non-competes, and trade secrets. CLF handles business disputes involving partnerships, contracts, and intellectual property.

General Counsel and Compliance

CLF provides general counsel and legal compliance advice to clients seeking to manage legal risk to their business relating to compliance with city, state, and federal law.

Criminal Law

CLF defends high-stakes criminal matters for professionals and business owners.

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White Collar Legal Team

Meet the team

Experienced advocates. Strategic leadership. One integrated firm.

Kris Costello

Founder
Kris Costello is a trial lawyer proven in the courtroom and in government investigations. For 25 years she has represented business owners, executives, and professionals in high-stakes white-collar, commercial, intellectual property, and government enforcement matters, frequently in parallel civil and criminal proceedings, often leading teams of attorneys. Costello has tried more than 50 cases in state and federal court and taught trial advocacy at the University of Washington for more than a decade. Her practice also includes arbitration and matters before administrative and licensing boards. Costello’s approach is strategic and precise, focused on protecting her clients’ businesses, careers, and reputations.

Wendy Harper

Attorney
Wendy Harper is a seasoned criminal defense attorney, an experienced civil, commercial, employment, and regulatory litigator, and a former prosecutor. She clerked for the Honorable D. Duff McKee in Boise, Idaho, served as an Assistant Seattle City Attorney, and practiced criminal defense at national firms. Over 25 years Harper has tried cases to verdict and built deep litigation and internal-investigation experience across employment and commercial matters. Most recently, she worked with the Federal Civil Rights Legal Clinic, advising on civil rights, employment claims, and alleged abuse of process by government actors.

Nari Weaver

Chief Of Staff
Nari Weaver leads operations and communications at Costello Law Firm. She brings 15 years of experience leading professionals and projects toward ambitious, shared goals. She keeps the firm running behind every matter, so its attorneys stay focused on the case and every client is guided through a clear, responsive process from first call to resolution. Prior to joining Costello, Weaver was Executive Director of Development for the Seattle Latino Film Festival and led its event production, partnerships, and communications. She is bilingual in English and Spanish.

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