Green B. Jameson, chief engineer of the Alamo, son of Benjamin Jameson of New Jersey, was born in Kentucky or Tennessee in 1809. His grandfather, John Jameson, was an early lieutenant governor of Virginia. Jameson, a lawyer, moved to Texas in 1830 and settled in Brazoria. He took part in the siege of Bexar in 1835, then remained in Bexar under the command of Lt. Col. James C. Neill as chief engineer of the garrison occupying the town and the Alamo. Jameson's correspondence with Sam Houston in the weeks before the Alamo siege began gave detailed descriptions of the Alamo's defenses. On the first day of the siege, February 23, 1836, Jameson was sent by James Bowie as a messenger to the Mexican forces. He died in the battle of the Alamo on March 6, 1836.