Andrew D. "Andy" Lipman

For more information, please visit www.gibsondunn.com/lawyer/walker-helgi-c/ .

Michael D. Hausfeld is a top attorney recognized by Best Lawyers in the practice area(s) of Antitrust Law and Litigation - Antitrust. Michael D., who practices law in Washington, District of Columbia, has been recognized since 2006. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael D. is held by other top lawyers in the same geographic and legal practice area.

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.

When asked about Paul Schwinn, clients most often comment on his demeanor, his responsiveness and his business-minded approach to legal issues and opportunities. Working with clients across a wide range of industries, including technology, hospitality (including restaurants), oil and gas, biotech and government contracts, Paul provides counsel on a wide variety of transaction structures commonly utilized in such industries. Clients view him as an all-around business and legal advisor. During ...

Lita Rosario-Richardson is a top attorney recognized by Best Lawyers in the practice area(s) of Copyright Law. Lita, who practices law in Potomac, Maryland, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lita is held by other top lawyers in the same geographic and legal practice area.

Matt Moore maintains a sophisticated real estate and commercial litigation practice. He has successfully litigated complex contract disputes involving ADA architectural issues, housing discrimination, property contamination and defects, mortgage fraud, broker misconduct and premises liability. Over the past several years, Matt has successfully defended several ADA, premises liability, contamination and defect claims. He has obtained and collected several million-dollar verdicts for his commer...

Mark J. Riedy is a top attorney recognized by Best Lawyers in the practice area(s) of Mergers and Acquisitions Law. Mark J., 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 Mark J. is held by other top lawyers in the same geographic and legal practice area.

Constantine G. Papavizas is a top attorney recognized by Best Lawyers in the practice area(s) of Admiralty and Maritime Law. Constantine G., who practices law in Washington, District of Columbia, has been recognized since 2008. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Constantine G. is held by other top lawyers in the same geographic and legal practice area.

Tina Papagiannopoulos is a top attorney recognized by Best Lawyers in the practice area(s) of Health Care Law. Tina, who practices law in Washington, District of Columbia, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Tina is held by other top lawyers in the same geographic and legal practice area.

Christopher S. Rizek is a Member in Caplin & Drysdale's Washington, D.C., office. He also serves as General Counsel to the firm. In 2014, he was listed in the elite "Leading Lawyer" list for Tax Controversy by The Legal 500 . Services Mr. Rizek represents taxpayers in all types of federal civil and criminal tax controversy matters. He also guides clients through IRS audits, prepares administrative claims and protests of IRS actions, and litigates tax and tax-related cases in U.S. district...