Top 21 Security Experts to follow on Twitter in 2021 From the article on Security Boulevard. Rafay Baloch Troy Hunt Kevin Mitnick Rachel Tobac Mikko Hyppönen Katie Moussouris Bruce Schneier Brian Krebs Jeremiah Grossman Eugene Kaspersky Dan Lohemann Steve Morgan Tyler Cohen Wood Graham Cluley Theresa Payton Shira Rubinoff Eva Galperin Marcus J. Carey Jayson E Street Paul Asadoorian Adam K. Levin