David P. Mattern

Bryan H. Parr is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar. Bryan H., who practices law in Washington, District of Columbia, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Bryan H. is held by other top lawyers in the same geographic and legal practice area.

Justin Flint is a top attorney recognized by Best Lawyers in the practice area(s) of Ethics and Professional Responsibility Law. Justin, who practices law in Washington, District of Columbia, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Justin is held by other top lawyers in the same geographic and legal practice area.

Thomas (Tom) Berger’s practice is based on an in-depth understanding of and experience with the chemicals, plastics, and electronics industries. As a preeminent practitioner with over 30 years of experience, Tom helps clients commercialize new chemical products and preserve supply chains for existing chemical products utilizing an interdisciplinary team approach combining law and science, with an emphasis on emerging technologies in the industrial and consumer chemicals areas. Tom&rsquo...

Matthew D. Berkowitz is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Mass Tort Litigation / Class Actions - Defendants. Matthew 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 Matthew D. is held by other top lawyers in the same geographic and legal practice area.

Jiayan Chen is deeply experienced in the regulatory, transactional and strategic issues that arise when leveraging health information, biospecimens and technology to drive healthcare innovation and quality. She guides stakeholders on privacy compliance and research compliance and in the context of strategic initiatives and collaborations as they seek to harness the power of data, machine learning, DNA sequencing and technologies to develop and deploy new products and solutions and address cha...

Frederick W. Miller is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Frederick W., who practices law in Washington, District of Columbia, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Frederick W. is held by other top lawyers in the same geographic and legal practice area.

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

William McConagha is a top attorney recognized by Best Lawyers in the practice area(s) of FDA Law. William, who practices law in Washington, District of Columbia, has been recognized since 2014. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which William is held by other top lawyers in the same geographic and legal practice area.

George Sepsakos is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law. George, who practices law in Washington, District of Columbia, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which George is held by other top lawyers in the same geographic and legal practice area.

Larry Bard is a highly regarded business attorney whose clients depend on his guidance in corporate finance and securities law matters, including public and private offerings, venture capital transactions and other financing transactions. He advises companies on issues of corporate governance, business planning, securities law compliance, executive compensation, commercial contracts and complex joint ventures. Larry has completed several initial public offerings for companies in the mid-Atlan...