“Jonathan Daniel Hamm was born on March 10, 1971, in St. Louis, Missouri,[8][9] the son of Deborah (née Garner) Hamm, a secretary, and Daniel Hamm, who managed a family trucking company.[10][11][12] Hamm is of German, French, English, and Irish descent; his surname came from German immigrants.[13] He was raised Catholic.[14] His parents divorced when he was two years old, and he lived in the St. Louis suburb of Creve Coeur with his mother[12] until her death from colon cancer when Hamm was 10 years old.[15] He then lived with his father and grandmother in nearby Normandy[16] until his father died ten years after his mother. Jon was 20.[17]”

(http://www.autoadmit.com/thread.php?thread_id=5298874&forum_id=2#48952077)