John Marston

Richard’s multinational clients benefit from his extensive experience with tax planning and controversy and trust his guidance to resolve challenging transfer-pricing issues as well as to develop, implement, and defend tax-efficient cross-border structures. For more than 25 years, he has advised clients on tax matters, with a focus on transfer pricing. Richard’s international clients span multiple industries, including transportation, finance, hospitality, electronics, food and be...

Amy E. Totten approaches every case by carefully considering all perspectives involved. As a former prosecutor, she understands the importance of thorough preparation for trial and thoughtful analysis, particularly when clients are facing significant, life-changing circumstances. Her ability to anticipate opposing arguments allows her to develop practical strategies tailored to each client’s situation. Over more than two decades in legal practice, Amy has handled thousands of matters ra...

During his more than 30 years of practice, Mr. Jaffe has focused on dispute resolution internationally in arbitrations under various international arbitral regimes and domestically in court and arbitration proceedings. A significant part of his work has involved representing owners, contractors and other stakeholders in projects ranging from infrastructure and energy facilities to sports stadiums and a wide variety of commercial structures. He has acted as counsel in numerous international an...

David Ault is a top attorney recognized by Best Lawyers in the practice area(s) of Health Care Law. David, 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 David is held by other top lawyers in the same geographic and legal practice area.

Brian Lubkeman has practiced in the Washington, D.C. metropolitan area for over 20 years, concentrating on complex real estate transactions (both developed and raw-land transactions, from acquisition through disposition); real estate development matters; commercial lending transactions (for borrowers and lenders); and commercial leasing (both landlord and tenant representations, for public and private companies, across all property types, including retail, commercial, industrial and specialty...

Matthew W. Morrison is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law. Matthew W., who practices law in Washington, District of Columbia, has been recognized since 2019. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Matthew W. is held by other top lawyers in the same geographic and legal practice area.

Mark L. Whitaker is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property. Mark L., who practices law in Washington, District of Columbia, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Mark L. is held by other top lawyers in the same geographic and legal practice area.

Don Sperling’s extensive experience handling issues related to businesses, from start-ups to fully matured companies, enables him to evaluate clients’ legal and business concerns and opportunities from multiple angles. He adeptly guides them through short- and long-term considerations for their businesses, whether in the context of a potential merger or acquisition, key hire, a real estate transaction, an employment issue, a business strategic planning consideration or a litigatio...

Jay E. Silberg is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law. Jay E., who practices law in Washington, District of Columbia, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jay E. is held by other top lawyers in the same geographic and legal practice area.

Louis Mazawey brings decades of experience as an authority on the tax aspects of employee benefits in all forms to his work at Groom. As counsel to major insurance companies and a variety of plan sponsors—including corporate employers, trade associations, and public retirement systems—Lou has worked closely with qualified plans, 403(b) and 457 plans, IRAs, employee stock ownership plans, executive compensation, retiree medical benefits, plan terminations, mergers and spinoffs, the...