A letter of certification is a letter that is used to verify previous information in written form, usually past employment. If you were looking for a new job, you would request a letter of certification from your previous employer verifying that you did work for them in the past and in what capacity. Mr. James Roberts 3146 Holden Street Metropolis, IL 62960 This letter is to certify that James Brown worked as a general accountant at Triangle corp. for the period from November 5th, 20013 to December 12th, 2013. While at our company, his responsibilities were to design and implement pricing controls in relation to our line of mathematical measuring devices. Through our working relationship, I cam to appreciate the attention to detail that James showed for his work and was deeply saddened when he departed our company. I know that he will do a great job wherever you put him in you organization. Sincerely, Joseph Mancini