First appearance = [B][I]All-Star Comics #15[/I][/B] (February-March 1943)
[img]https://i67.servimg.com/u/f67/18/91/37/14/all-st21.jpg[/img]
[img]https://i67.servimg.com/u/f67/18/91/37/14/brain_11.jpg[/img]
And from [B][I]Who's Who: The Definitive Directory of the DC Universe Vol. III[/I][/B] (May 1985)
[img]https://i67.servimg.com/u/f67/18/91/37/14/brain_10.jpg[/img]