Board Thread:Questions and Answers/@comment-27824660-20160218231604/@comment-28728239-20160710123551

He's not a founding member of the League. He joined after Crisis in the Justice League International, and I recall he later left.

In The New 52, he joins after Trinity War, and I imagine you'll be seeing him in future events. One good thing New 52 did was make sense of JLA history. It was as soaking hot mess before.