Josef was a human teacher on earth for many years, believing fully that humans were alone in the universe. After the discovery of the Stargate, Josef was approached by the Phoenix Squadron to help with the manufacturing of the synthetic Tretonin. While on a research trip on the planet Pangar, the phoenix site was attacked and another scientist was killed. Unknown to Josef before, this scientist hosted a Tok'ra, that would not survive without another host. Josef saw no other alternative, and allowed this Tok'ra to inhabit him, this bonding them in a desire to find a way to understand what has brought the galaxy to these violent and destructive ways.