Who is Peiter 'Mudge' Zatko, the Twitter whistleblower?

Peiter 'Mudge' Zatko, who filed a whistleblower disclosure with the US Securities and Exchange Commission against Twitter, was Twitter's security chief from November 2020 to January 2022. He is a famous hacker and one of US' top cybersecurity experts. Before Twitter, Zatko oversaw security at the electronic payments company Stripe. He also worked on special projects at Google.