He was a Negro League manager. He also had a seat on the Negro League Board.
Presuming you mean the "Justice League" series (2001-2006), there is no such episode where he 'meets them'. He was there at the end of "Secret Origins Part 3" when they decided to become a team but he declined to become a full member but told them to call when they needed him.
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JL Audio was created in 1975.
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JL Studios Recording was created in 1989.
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JL Audio was founded in 1975 by James Birch and Lucio Proni
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