He was a genealogist and historian. He wrote multiple important genealogical and biographical works, including:
Genealogical History of the Royal and Illustrious Family of the Stewarts from the year 1034 to the year 1710; to which are added the Acts of Sederunt and Articles of Regulation relating to them; to which is prefixed a General Description of the Shire of Renfrew, Edinburgh, 1710;
The Peerage of Scotland, containing an Historical and Genealogical Account of the Nobility of that Kingdom, Edinburgh, 1716; and
Lives and Characters of the Crown Officers of Scotland, from the Reign of King David I to the Union of the two Kingdoms, with an Appendix of Original Papers, vol. i. 1726.
The Description of the Shire of Renfrew was published separately, with a continuation by Semple, at Paisley in 1788, and a second edition, with a continuation by Robertson, also at Paisley, 1818.
The "Letters of Simon, Lord Fraser, to George Crawfurd, 1728–30", while the Lovat case was in progress, were published in the Spottiswoode Miscellany, 400–9.
Laurus Crawfordiana: A manuscript on the Scottish noble House of Crawford whose history and genealogy goes back to the 11th century. It bears the subtitle of "A Historicall and Genealogical Deduction of the Several families of the sir name of Crawfurd as weel such as are extinct as those who are yet extant from the time of King David the 1 till the present time". It covers the early history and genealogy of the descendants of the Crawford surname.
This manuscript (available solely at the Library of Edinburgh) has been transcribed and interpreted by Dr. Raymond Crawford for the Clan Crawford Association and is considered by the clan leadership as the authoritative source for Crawford genealogical study in Scotland pre-1740. George had created a reputation that enabled him to access family records from the various family houses and private collections that ordinary researchers would not have had access to, and his thorough and careful history of research gives confidence in his notes. Though it was an unpublished and unfinished work (and therefore some conflicts are noted within) the author has documented his opinions and findings based on records that he has reviewed personally or members of the family with whom he has met and discussed the matter.
The obit has a date of of death of 1 Dec 1748  and FindAGrave has 24 Dec 1748. "Shire of Renfrew" also has 24 Dc 1748 and the date of obit is probably an error.
Daughter Margaret, twin of Jean, is not mentioned in "Shire of Renfrew." Possibly she died young.
"British Newspaper Archive, Family Notices," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPZW-B2JX : 17 April 2019), George Crawfurd, Esq, Edinburgh, Edinburghshire, Scotland, United Kingdom; records extracted FamilySearch and images digitized by FindMyPast; citing Edinburgh, Edinburghshire, Scotland, United Kingdom, 1 Dec 1748, The British Newspaper Archive, Ireland; FHL microfilm .
Burke, John Bernard, "A Genealogical and Heraldic Dictionary of the Peerage and Baronetage the British Empire", London: Harrison, 1868, Ed. 30 Part 2
Crawfurd, George, "A General Description of the Shire of Renfrew: Including an Account of the Noble and Ancient Families ... To which is Added, a Genealogical History of the Royal House of Stewart, and of the Several Noble and Illustrious Families of that Name, from the Year 1034 to the Year 1710", Paisley: J.Neilson , 1818
Murray, Thomas, "Biographical Annals of The Parish of Colinton", Edinburgh: Edmonston and Douglas, 1863
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It may be possible to confirm family relationships with George by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Wayne Prather :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R1a1a-CTS4179, FTDNA kit #78145 +
Y-Chromosome Test 111 markers, haplogroup R1a1a