Twitter has named a new head of security a few months after the website had to deal with the Bitcoin hack that compromised a number of high-profile accounts. The company hired Peiter Zatko, more widely known by his hacker name “Mudge,” to lead its security efforts. According to CNBC, he’s expected to take over after a 45- to 60-day review of the platform’s current measures and practices, and he’ll report directly to CEO Jack Dorsey.