So you think he left a (very) well paying job, working on a project that he created and has been building for nine years, one that he is now working on for no pay, just because a black woman became his manager? I dare say you are subconsciously biased, perhaps consciously biased. Subconsciously biased in that you won't even allow yourself to consider the possibilty that a black woman could be a bad manager, so bad that it would cause a prolific engineer like Ian to leave, and consciously biased in that you then actively jump to resolve your subconscious bias' flaw with reality with racism.