Kees Cook has been working with Free Software since 1994, has been a Debian Developer since 2007, and has been a member of the Linux Kernel Technical Advisory Board since 2019. He is currently employed as a Linux kernel security engineer by Google, focusing on upstream kernel security defenses. From 2006 through 2011 he worked for Canonical as the Ubuntu Security Team's Tech Lead. Before that, he worked as the lead sysadmin at OSDL, before it was the Linux Foundation. He has written various utilities including GOPchop and Sendpage, and contributes randomly to other projects including fun chunks of code in OpenSSH, Inkscape, Wine, MPlayer, and Wireshark.