August 12, 1812, New York City.
December 29, 1899, Philadelphia, Pennsylvania.
Mount Vernon Cemetery, Philadelphia, Pennsylvania.
At age 14, MacKellar entered the printing company of Harper Brothers. In 1833, he moved to Philadelphia, Pennsylvania, and joined the type foundry of Johnson & Smith as a proofreader. He subsequently became a foreman, then a partner, in the firm, which from 1860 was known as MacKellar, Smiths and Jordan. MacKellar’s works include: