This is Lord Backael's comment from Steam: "Hi all. I'm one of the Kickstarter backers of Geneforge Mutagen, with Chris being my pledge tier reward. He's a nod to the first creations my brother and I would name when playing the original Geneforge a bit less than 20 years ago now, and I wanted him to be a small, but useful contribution that everyone could benefit from (IE. the gemstone and XP he gives from leadership skill checks).
To answer the OP's question: as of 1.0.1, Chris' master never appears in-game, and thus he effectively disappears once you convince him to leave. With that said,