The "keys to the Internet" is a misnomer. He is a "recovery key shareholder", which means he holds a smart card in an m-of-n configuration that allows ICANN to decrypt a backup of the Root Zone Key Signing Key in a disaster recovery scenario should the KSK need to be rebuilt.

The primary roles are the cryptographic officers, these are Internet community members who attend key signing ceremonies to observe use of the KSK.

Here are a list of the trusted community representatives: https://www.iana.org/dnssec/tcrs