Todd

Doctor Todd is a scientist working for the Knights Templar in the Cairo Arcology during Deus Ex: Invisible War.

Background
He is residing in Flight Bay 23, on level 110 and is surrounded by several Templar Paladins and an RB-76 Military bot. He will ask Alex for a sample of their blood, in hopes of making a "Plague" that will wipe out all nano augmentations in the world, fulfilling the Templar's hopes of Genetic Purity. Giving the blood sample will not necessarily get the Knights Templar ending to the game, as the player still can upload the Aquinas Protocol to the Illuminati, ApostleCorp, or to neither faction, and get a different ending to the game, but siding with Dr. Todd will give the player a peaceful standing with Saman and the other Templars on Liberty Island later in the game.

Interactions with the player character
Even if the player doesn't plan on helping the Templars, they will likely still confront Todd, as Paul Denton's frozen body is being held in Flight Bay 23, behind him.