Isaac Roberdeau (1763–1829)
In 1790 Roberdeau retained Bushrod Washington's services in a legal matter.
Isaac Roberdeau, civil engineer and eldest son of Daniel Roberdeau, was born in Philadelphia on 11 September 1763. After studying in England, he returned to the U.S. and worked as an assistant engineer in the planning of Washington, D.C. He thereafter was an agent for the Pennsylvania board of directors of canals and turnpikes and (during the War of 1812) a major in the Topographical Engineer Corps. In 1818 Roberdeau organized the Topographical Bureau of the United States, which he would head for more than a decade.
Roberdeau Buchanan, Genealogy of the Roberdeau Family, Including a Biography of General Daniel Roberdeau of the Revolutionary Army, and the Continental Congress; and Signer of the Articles of Confederation (Washington, D.C.: Joseph L. Pearson, 1876), 104–122.
"Roberdeau, Isaac (1763–1829)," Oxford Essential Dictionary of the U.S. Military (Oxford University Press, 2002).
Delaware Register, or, Farmers', Manufacturers', & Mechanics' Advocate (Wilmington), 24 January 1829, page 7, column 2 (Newspapers.com).
Lt Col Isaac Roberdeau at Family Search.