Question: Who was the Scots-Irish builder who once worked for the principal author of the Declaration of Independence?

Context articles: The World of Science (Golden book)
Mecklenburg Declaration of Independence
Gerhard Lindblom
Thomas Jefferson: Author of America
Thomas Jefferson
George Childress
Edward J. Phelan
Nicholas Barr
Oak Lawn (Charlottesville, Virginia)
Declaration of Sentiments

The World of Science was a youth-oriented science book first published in 1958 under the Golden Books imprint.
 The principal author was Jane Werner Watson, but the science material was contributed by contemporary scientists, many of whom worked at the California Institute of Technology, including the author's husband Earnest C. Watson (1892-1970), who was Dean of the Faculty from 1945 to 1959.
The Mecklenburg Declaration of Independence published in 1819, was asserted to be the first declaration of independence made in the Thirteen Colonies during the American Revolution.
 It was supposedly signed on May 20, 1775, in Charlotte, North Carolina, by a committee of citizens of Mecklenburg County, who declared independence from Great Britain after hearing of the battle of Lexington.
 If the story is true, the Mecklenburg Declaration preceded the United States Declaration of Independence by more than a year.
 The authenticity of the Mecklenburg Declaration has been disputed since it was published, forty-four years after it was reputedly written.
 There is no conclusive evidence to confirm the original document's existence, and no reference to it has been found in extant newspapers from 1775.
Karl Gerhard Lindblom (26 August 1887 – 8 June 1969) was an ethnographer from Sweden who worked in East Africa in the 1910s.
 He was the principal author of materials on the Akamba peoples.
Thomas Jefferson: Author of America is a short biography of Thomas Jefferson, the third President of the United States (1801–09) and the principal author of the Declaration of Independence (1776), by author, journalist and literary critic Christopher Hitchens.
Thomas Jefferson (April 13 [O.S. April 2] 1743 – July 4, 1826) was an American Founding Father who was the principal author of the Declaration of Independence and later served as the third President of the United States from 1801 to 1809.
 Previously, he was elected the second Vice President of the United States, serving under John Adams from 1797 to 1801.
 A proponent of democracy, republicanism, and individual rights motivating American colonists to break from Great Britain and form a new nation, he produced formative documents and decisions at both the state and national level.
 He was a land owner and farmer.
George Campbell Childress (January 8, 1804 – October 6, 1841) was a lawyer, politician, and a principal author of the Texas Declaration of Independence.
Edward Joseph Phelan (July 25, 1888 – September 15, 1967), frequently E. J. Phelan, was the first appointed international civil servant and fourth Director-General of the International Labour Office, serving from 1941 to 1948, during most of which time the ILO was temporarily relocated to Montréal from Geneva.
 Phelan was the principal author of the Declaration of Philadelphia.
Nicholas Barr FRSA is a British economist, currently serving as professor of public economics at the London School of Economics (LSE).
 He received his Ph.D. in Economics as a Fulbright Scholar from the University of California, Berkeley and his MSc in Economics from LSE.
 According to his LSE biography, he has worked for the World Bank, "from 1990 to 1992 working on the design of income transfers and health finance in Central and Eastern Europe and Russia, and in 1995-96 as a principal author of the World Bank's World Development Report 1996: From Plan to Market."
 He also served as an advisor to the British, Chinese and South African governments.
Oak Lawn is a historic home located at Charlottesville, Virginia.
 The brick dwelling was built in 1822, and consists of a two-story, four bay, main block flanked by one-story, two bay wings.
 The central section has a front gable roof and one-story porch with a flat roof supported by four Tuscan order columns and topped by a second story balcony.
 Exterior chimneys arise between the main block and each of the wings.
 Also on the property are a contributing kitchen (1822) and two cemeteries.
 It was built by James Dinsmore, a Scots-Irish builder who worked for Thomas Jefferson.
The Declaration of Sentiments, also known as the Declaration of Rights and Sentiments, is a document signed in 1848 by 68 women and 32 men—100 out of some 300 attendees at the first women's rights convention to be organized by women.
 Held in Seneca Falls, New York, it is now known as the Seneca Falls Convention.
 The principal author of the Declaration was Elizabeth Cady Stanton, who modeled it upon the United States Declaration of Independence.
 She was a key organizer of the convention along with Lucretia Coffin Mott, and Martha Coffin Wright.