President Barack Obama nominated two new members to the Metropolitan Washington Airports Authority board — one to replace former chairman Charles Snelling, who committed suicide in March, and one to replace Bob Brown, who has remained a vocal member of the board even though his term expired in November 2011, the White House said.

The president named William Shaw McDermott, a Boston-based lawyer, and Nina Mitchell Wells, a former New Jersey secretary of state, to the board that is overseeing one of the largest public works programs in the country, the construction of Metro’s Silver Line to Dulles International Airport.