Mark Lassard is a character featured in RAGE. He is a resident of Subway Town and a member of the Resistance. He can be found in Subway Town, in the local Resistance Base. Lassard is the Resistance's computer technologies specialist.
Upon completion of the quest "Gaining Influence", he will ask Nicholas Raine to head to the Jackal Canyon, locate an Ark that emerged nearby and retrieve the Ark's Decrypter. He can also give the player the Authority Augmenter schematic.
It is unknown whether or not Lassard is an Ark Survivor, but his proficiency with technology and knowledge on the subject of Ark internal computer systems may hint to him being one.