Sir:
I have found a few bits of information on a businessman in New Orleans by the name of Thompson Greenfield but he is never addressed as a Colonel. Therefore, I am not sure if this is the same man to whom you are referring:
Thompson Greenfield has an obituary in the Daily Picayune Newspaper which may or may not provide some biographical information. Here is the citation:
Greenfield, Thompson
Death date: 1877-01-24
Age: 61 years
Sex: M
Obituary citation(s):
Daily Picayune, 1877-01-26, Pg. 4 col. 5
Daily Picayune, 1877-01-28, Pg. 12 col. 2
Prior to September 1862 Thompson Greenfield was a partner with Cornelius Fellows and Daniel P. Logan in the firm of Fellows & Company of New Orleans.
Listed in the New Orleans City Directory of 1861 as employed by Fellows & Company.
Listed in the New Orleans City Directory of 1851 and no occupation was given.
During the Civil War he went to Liverpool, England and established himself in business and became a commercial agent of the Confederate government at a salary of 10,000 dollars a year.
On August 24th 1867 he was living in New York City and filed for bankruptcy.
Listed in the New Orleans City Directory of 1875, 1876, and 1877 as a tobacco broker.
I could not find any personal information. Regards---