Expert received his law degree in 1968 from the Georgetown University Law Center. He immediately became a Trial Attorney for the FDA, representing the Agency in civil and criminal enforcement cases in court. He also represented the FDA in defensive and appellate litigation in court. From this position, he became the Special Assistant to the Chief Counsel where he assisted with law office management, resolved problems with staff employees and was responsible for special projects. In 1975 he became the Deputy for Regulations and Hearings. This position required him to manage the legal review and clearance of Agency regulations, the program review services, and administrative hearings. He became the Deputy Chief Counsel in 1979, a position he held for 20 years. In that position he assisted the Chief Counsel with internal management, provided legal service and advice to high-ranking FDA officials, represented the FDA in functions involving other federal agencies, and improved the process of reviewing proposed legal and regulatory actions. His final role at the FDA was as a Senior Advisor to the Chief Counsel. While there he provided consultant advice, assistance, and services concerning operations and management. He was responsible for the law office redesign and reorganization, and managed the attorney recruitment and selection program. Expert received numerous awards in his time with the FDA, such as the Commissioner's Special Citation in 1989 and 1999. He is also a member of the District of Columbia Bar Association.

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