Hello, my name is Alexander G.
I am an independent validator with 15 years of CTO experience and 20+ years in IT total.
AG PoS history started in 2019 with testnets and now AG validators support these major networks:
Centrifuge validator intro (june 2020): [Validator Introduction] AG
Polkadot validator stats: Polkadot/Substrate Portal
Kusama validator stats: Polkadot/Substrate Portal, Polkadot/Substrate Portal
Solana mainnet (approx $220m staked SOL): Solana Validators | www.validators.app
CELO validator stats: Celo Explorer - BlockScout