In June 1778, having been trained as a surveyor by James Clinton, the husband of Simeon's aunt Mary, De Witt was appointed as assistant to the Geographer and Surveyor of the Army Colonel Robert Erskine and contributed to a number of historically significant maps.
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During the Revolutionary War, when cut off from trade with Europe, colonists had to make their own maps; De Witt assisted military geographer and surveyor general Robert Erskine in drawing the maps needed by George Washington.
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On May 25, 2010 the Smithsonian Institution National Museum of American History exhibited the oldest surviving Anglo-American star map, hand-drawn in 1780 by Simeon De Witt, in its Albert H. Small Documents Gallery.
Marcos Witt | Simeon Saxe-Coburg-Gotha | San Simeon, California | Jean-Baptiste-Siméon Chardin | Simeon | Johan de Witt | Simeon Rice | Siméon Denis Poisson | San Simeon | Katarina Witt | Alicia Witt | Simeon Solomon | Simeon Bekbulatovich | Saint Simeon | Joachim Witt | Charles Simeon | Weekends with Alex Witt | Thomas De Witt Talmage | Sir John Simeon, 3rd Baronet | Simeon I of Bulgaria | Simeon II | Simeon Djankov | Simeon Career Academy | Simeon Baldwin | Ernst Witt | Elise Witt | Sir John Simeon, 1st Baronet | Sir John Simeon | Simeon Toribio | Simeon S. Willis |