Ian Grigg invented triple-entry book-keeping and the Ricardian contract, both of which became foundational reference points for those developing blockchain.
He spoke at the Internet of Agreements conference in 2017 and Jason Louv interviewed him. This article contains the interview and a text transcript.
If you want to see the interview right now, then wait no more:
In October 2018 Ian Grigg took part in a question and answer session, published at Kionoki. Here he talks about identity and chamas, and why he believes that “blockchain and identity don’t mix”.