"JAMDAT was founded by Scott Lahman and Zack Norman, two ex-Activision executives, and Austin Murray in March of 2000. They were joined in November of that year by Mitch Lasky, who had also worked at Activision, who became the CEO of JAMDAT. JAMDAT went public in late 2004.
On December 9, 2005, it was announced that JAMDAT was going to be purchased by Electronic Arts for US$680 million. The acquisition occurred on February 14, 2006, and the JAMDAT name was retired."
Source: Wikipedia, "[en.wikipedia.org/wiki/EA_Mobile EA Mobile]", available under the CC-BY-SA License.