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Graphene (DPoS 2.0) is name of blockchain that Dan Larimer made in 2015 for Bitshares 2.0 as performance upgrade for Bitshares 1.0 - made in 2014, DPoS 1.0 is still in use in LISK).
Second project was STEEM(it) 2016 and now he is building EOS (DPoS v3.0)

Thanks for clarifying the history. Especially the LISK connection.