Len is a cypherpunk and privacy advocate. He worked for Network Associates on the PGP encryption software, is a member of the Shmoo Group, a contributor to the OpenPGP IETF working group, the GNU Privacy Guard project, and frequently appears at technology conferences like DEF CON. Len is the co-founder of CodeCon along with Bram Cohen, co-author of the Zimmmermann-Sassaman key signing protocol, and was an organizer of the protests following the arrest of Dmitry Sklyarov. He is also the operator of the long-running MUD, Shadows of Infinity.