Billy Rios (discovered GIFAR) http://xs-sniper.com/blog/

Michal Zalewski (one of the top security researchers in the world, wrote "The Tangled Web", a must-read) http://lcamtuf.blogspot.com

Neal Poole: https://nealpoole.com/blog/

Nir Goldshlager: http://www.nirgoldshlager.com/

Michael Brooks: https://sitewatch.me/en/Blog

Nils Jünemann: http://www.nilsjuenemann.de/

Stefano di Paola (Minded Security): http://blog.mindedsecurity.com/

Root Labs: http://rdist.root.org/