Co-Founder | Partner
Attorney, Entrepreneur, and Strategic Growth Leader
Katherine O’Brien is the co-founder of National Security Law Firm and one of the driving forces behind the firm’s growth, expansion, and long-term strategic direction. Since the firm’s founding, she has played a central role in identifying underserved legal markets, developing new practice areas, building operational infrastructure, and helping transform the firm into a nationally recognized practice serving individuals, service members, federal employees, contractors, and businesses navigating complex government systems.
Throughout her career, Katherine has demonstrated a unique ability to identify legal problems that are often overlooked or underserved by the broader legal industry and build practical solutions around them. Rather than focusing solely on traditional practice areas, she has repeatedly recognized emerging and underserved client needs, helping create and expand national practices serving individuals facing complex government, administrative, and reputational challenges. Her ability to recognize unmet demand, understand evolving government systems, and develop scalable legal services has been a significant factor in the firm’s growth and success.
Before helping build National Security Law Firm, Katherine founded and operated her own law practice focused on record clearing, trusted traveler program appeals, credentialing matters, content removal, and other emerging areas where individuals often struggled to find experienced legal representation. By identifying underserved legal needs and developing innovative solutions around them, she built a successful practice serving clients throughout the United States. That entrepreneurial experience continues to influence her approach to innovation, client service, and practice-area development today.
Earlier in her career, Katherine maintained a litigation practice handling criminal defense, civil litigation, personal injury, medical malpractice, commercial disputes, and appellate matters in New Jersey and New York. Her experience representing individuals facing difficult legal challenges continues to shape her commitment to practical problem-solving, accessibility, and client service.
Today, Katherine continues to guide the firm’s strategic direction, evaluate emerging opportunities, develop new practice areas, and help ensure the firm remains responsive to the evolving needs of its clients. Her focus is simple: identify real problems, build effective solutions, attract exceptional professionals, and create an organization capable of helping individuals navigate some of the most complex government, military, and administrative systems in the country.
Jurisdictions Admitted: New York and New Jersey.
Education: J.D., Case Western Reserve University School of Law; B.A., Ohio University, with honors.