George Blake Grinnell

George Blake Grinell (November 11, 1823 – December 19, 1891) was an American merchant and financier.

He was educated in the public schools of Greenfield, and as a boy went to Auburn, New York, employed in the bank of his uncle, James Seymour.

In 1843 he came to New York City, and took a position in the wholesale dry-goods house of his cousin, George Bird.

In 1857 he became a partner, and on the death of his cousin he continued the business until 1861, forming a partnership with Levi P. Morton (later Governor of the New York and Vice President of the United States) under the firm name of Morton, Grinnell & Co. which was a successful operation until the breaking out of the Civil War, when it failed along with many other businesses.

In 1866 he formed a partnership with Wellington Clapp, with Horace F. Clark as special partner, for the business of stockbroking.