The Jack Daniel's brand's official website suggests that its founder, Jasper Newton "Jack" Daniel, was born in 1850 (and his tombstone bears that date), but says his exact birth date is unknown. The company website says it is customary to celebrate his birthday in September. The Tennessee state library website said in 2013 that records list his birth date as September 5, 1846, and that the 1850 birth date seems impossible since his mother died in 1847. In the 2004 biography "Blood & Whiskey: The Life and Times of Jack Daniel", author Peter Krass said his investigation showed that Daniel was born in January 1849 (based on Jack's sister's diary, census records, and the date of death of Jack's mother).