Mark B. Langdon

Christopher Davies has more than 25 years' experience representing clients around the world in challenging circumstances. He has experience in complex civil, criminal and administrative matters, often involving crisis management. In just the past year, Mr. Davies has represented, among others: a party in the various investigations and litigation arising from the allision between the Dali and the Key Bridge; Norfolk Southern in investigations and litigation relating to the derailment in East P...

Komal Khan is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Komal, who practices law in Vienna, Virginia, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Komal is held by other top lawyers in the same geographic and legal practice area.

Matt Alegi solves problems. A deal lawyer with significant experience in dispute resolution and regulatory compliance, clients hire him because his practical, results-driven approach gets things done. While his legal practice spans a wide range of real estate and finance-related areas, Matt primarily concentrates on representing buyers, sellers and lenders in the acquisition, sale and financing of real estate. His practice also involves advising lenders and borrowers regarding problem loans, ...

John D. Seiver is a top attorney recognized by Best Lawyers in the practice area(s) of Communications Law. John D., who practices law in Washington, District of Columbia, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John D. is held by other top lawyers in the same geographic and legal practice area.

Jennifer Eller is co-chair of Groom’s Retirement Services Practice Group and Fiduciary Practice. She’s been with the firm since 1998, beginning as a law clerk, and has been a practicing attorney at Groom since 2000. As a practice group chair, Jenny ensures that the strategic direction and initiatives of the group position Groom to serve the needs of its financial, corporate, and public plan clients. In her practice, she operates from a similar perspective. She advises financial in...

Molly T. Senger is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Labor and Employment. Molly T., who practices law in Washington, District of Columbia, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Molly T. is held by other top lawyers in the same geographic and legal practice area.

Craig de Ridder is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Craig de, who practices law in Washington, District of Columbia, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Craig de is held by other top lawyers in the same geographic and legal practice area.

Arthur (Art) Garrett is Keller and Heckman’s General Counsel and co-chair of the firm’s national litigation practice. He advises clients on insurance recovery, with an emphasis on the representation of food industry policyholders in and out of court. Art specializes in advising food companies on their liability insurance programs, including GL, D&O, E&O, Excess/Umbrella, first-party property, and specialized insurance policies, such as product contamination insurance and m...

Jennifer Locke is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Jennifer, who practices law in Washington, District of Columbia, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jennifer is held by other top lawyers in the same geographic and legal practice area.

John's practice focuses on the representation of mutual funds, exchange-traded funds (ETFs), closed-end funds and business development companies (BDCs) and their independent board members. He advises clients on a range of matters, including the formation, operation, merger and liquidation of mutual funds, closed-end funds, ETFs, and BDCs. John has extensive experience working on transactions involving registered funds, such as adviser acquisitions, fund adoptions and product launches.