John Marshall Cook

Debra A. Harrison is a lawyer recognized by Best Lawyers in the practice area of Energy Law. Debra A. practices law in Washington, District of Columbia Best Lawyers has recognized Debra A. Harrison since 2026. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Debra A. Harrison is held by other lawyers.

Gregory J. Rupert is a lawyer recognized by Best Lawyers in the practice area of Tax Law. Gregory J. practices law in McLean, Virginia Best Lawyers has recognized Gregory J. Rupert since 2023. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Gregory J. Rupert is held by other lawyers.

An expert on ERISA’s fiduciary rules and government regulation of health insurance, including the Affordable Care Act (ACA), Jon Breyfogle counsels numerous financial services firms, health insurers, and their D.C.-based trade associations on retirement and health matters. His practice includes advice on regulatory and legislative strategies, compliance, and defense of federal and state investigations. Jon has testified before Congress and at Department of Labor hearings on both retirem...

Timothy J. V. Walsh is a lawyer recognized by Best Lawyers in the practice area of Energy Law. Timothy J. V. practices law in Washington, District of Columbia Best Lawyers has recognized Timothy J. V. Walsh since 2023. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Timothy J. V. Walsh is held by other lawyers.

Tania Klam is a cum laude graduate of George Mason University (B.A. in Government and International Politics with a minor in Legal Studies) and a graduate of the Penn State Dickinson School of Law (J.D. 2009). She is admitted to practice in Virginia, District of Columbia, New York, and Florida. She is fluent in Arabic and focuses her practice on Family Law. Ms. Klam began her legal career as a prosecutor in Brooklyn, New York where she served as an Assistant District Attorney. While there, sh...

Steve Kabler is a lawyer recognized by Best Lawyers in the practice area of Communications Law. Steve practices law in Washington, District of Columbia Best Lawyers has recognized Steve Kabler since 2027. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Steve Kabler is held by other lawyers.

I enjoy working with clients to ensure their family’s futures are secure, whether they are getting their first estate plan in place, assisting with estate or trust administration or helping to protect assets in case of divorce. I have developed long term relationships with clients, which allows me to alert them to changes in the law that may impact their plans. I am admitted to practice in Maryland, Virginia and the District of Columbia and I focus on the area of wills, trusts, estate p...

S. Libby Henninger is a lawyer recognized by Best Lawyers in the practice area of Litigation - Labor and Employment. S. Libby practices law in Washington, District of Columbia Best Lawyers has recognized S. Libby Henninger since 2020. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which S. Libby Henninger is held by other lawyers.

With nearly two decades of experience in government and private practice, Matthew Kulkin is well positioned to help financial market clients navigate complex legislative, regulatory, compliance and enforcement issues. Mr. Kulkin joined the firm in 2022 from another international law firm where he co-chaired its financial services practice group. Before that, he served as the Director of the US Commodity Futures Trading Commission's Division of Swap Dealer and Intermediary Oversight.

Charlie Speth helps companies and individuals navigate and solve their most difficult problems. A litigator with nearly 20 years of experience, he represents companies and individuals in complex civil litigation and government enforcement matters.