Andrew KollerAndrew Koller founded Ink, an Ethereum layer-2 blockchain developed by Kraken using the OP Stack.4 talks by Andrew KollerOnboarding Users, Not Just Holders: Scaling DeFi for Mass Adoption - Andrew KollerFireside chat with Ink ProtocolThe Real Reason Kraken Built an L2 | Andrew Koller & Hilmar OrthKraken Releases 'Ink' - An Ethereum L2 Powered by Optimism's OP Stack