De Brahm, The Surveyor

Source
“A Map...William De Brahm, Surveyor General to the Province of South Carolina, one of the Surveyors of Georgia 1757.”

John William Gerard de Brahm's story was found while conducting my Cameron research.  His wife was the mother of Matilda (Fenwick) Cameron Giles.

"...de Brahm is said to have been a Captain in the service of the Emperor before coming to America. In 1751 he aided in establishing a colony of Germans at Bethany in Georgia. In 1755 he was employed by South Carolina to reconstruct the fortifications of Charles Town, and thenceforward was constantly engaged in important military engineering and surveying work." [Source]

Florida Historical Society Publication
The Florida historical quarterly. Volume 20 Issue 04. April 1942.

According to the South Carolina Historical And Genealogical Magazine:

"His [Edward Fenwick's] widow. M". Mary Fenwick, married on 18 Feb., 1776, John William Gerard de Brahm... .  Mary de Brahm's will...was proved on 27" March, 1806. She describes herself as of Charleston, the widow of John William Gerard de Brahm, and mentions in her will : ...the grandson of her late husband, de Brahm...four nieces of said husband...who are said to have lost their whole property by the ravages of war...  ."

From the Duke University Libraries:
WILLIAM GERARD DE BRAHM PAPERS, 1755-1790.
Photostatic copy of a view and profile of a lighthouse to be erected in East Florida; estimate of materials and expenses for the project, 1761; papers relating to land surveys in St. John's Parish, 1760-1761; and an order for tea, 1759.  7 items.