Born at Haverhill, Massachusetts, son of bookbinder Jonathan Leavitt. George joined the family publishing house of Leavitt & Trow. Following the death of his father, the firm became Leavitt & Allen. He married Mary Catherine Cooley in 1848 and has seven children.
In 1856 he opened an auction house, Leavitt, Delissner & Co, to sell trade books. During the Civil War, Leavitt had financial difficulties and sold off his printing business.
The auction business became George A. Leavit & Co. This became the largest fine arts and book auction firm in New York City.
The firm conducted numismatic auctions for Alfred S. Robinson, John W.Klein and Benjamin Haines. A few numismatic lots were included in book sales.
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Catalogue of a Valuable Collection of American Coins & Medals, the Property of Charles Clay, M.D.
Full title: "Catalogue of a Valuable Collection of American Coins & Medals, the Property of Charles Clay, M.D., of Manchester, England. To be sold at Auction, by Geo. A. Leavitt & Co., at their Salesrooms, Clinton Hall, Astor Place, New York, on Tuesday, Wednesday, and Thursday evenings, December 5th, 6th, and 7th, 1871. Sale to commence each day at 5 o'clock."