GR translation: the late Roland Feldspath again, long-co-opted expert

[Mike Jing]

P240.34-241.2   And then, well, he is lately beginning to find his way into
one particular state of consciousness, not a dream certainly, perhaps what
used to be called a “reverie,” though one where the colors are more
primaries than pastels . . . and at such times it seems he has touched, and
stayed touching, for a while, a soul we know, a voice that has more than
once spoken through research-facility medium Carroll Eventyr: the late
Roland Feldspath again, long-co-opted expert on control systems, guidance
equations, feedback situations for this Aeronautical Establishment and that.

What does "co-opted" mean here?  And by whom?
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