Attorneys

Kathleen J.L. Holmes, Partner

Kathleen J.L. Holmes advises small businesses and technology start-ups and the people who invest in them. By working closely with business managers who are seeking to protect key business assets – including intellectual property and workforce talent – Kathy assists in negotiating and crafting agreements to achieve those goals. These agreements include software license and Saas agreements, employment agreements, nondisclosure agreements, teaming agreements and supplier agreements. Kathy also counsels business clients on trademarks, trade secrets, copyrights, and restrictions on competition and solicitation. Read more

Sheila M. Costin, Partner

Sheila M. Costin brings her nearly 30 years of experience as a trial attorney in the federal and state courts of Virginia and Maryland to help her clients achieve their goals effectively and efficiently.  As the head of HCM’s Guardians and Conservators practice group  she advises clients on fiduciary duties.  Sheila also represents clients in business disputes, and advises on the formation of new businesses.  Sheila has successfully represented administrators, executors, guardians, conservators, trustees and beneficiaries in litigation – including will contests; cases involving claims of wrongdoing against trustees, executors and conservators; and disputes among beneficiaries and heirs. Read more

Ellen D. Marcus, Partner

Ellen D. Marcus is civil trial lawyer with a proven track record of bringing business disputes to successful resolution for her clients, often after securing courtroom wins. She also advises clients who are starting new businesses or separating from existing ones. Having advocated for individuals and companies in business disputes for over 20 years, Ellen knows first-hand that having clear and well-thought-out agreements in the beginning can minimize the risk of costly litigation later on. Read more

John W. McKenzie

John W. McKenzie is a trial lawyer who helps clients facing business, malpractice, fiduciary, and government disputes.  He represents plaintiffs and defendants.  He handles everything from original complaints to appeals before the highest state and federal courts in the country.  He is licensed to practice law in the District of Columbia, Maryland, and Texas.  Read more