Doctor Wellington Yueh was the personal physician of Duke Leto Atreides, and ultimately the one to set the plot in motion by
betraying the Duke and his forces to the Harkonnens on Arrakis.
Much stock was placed in the fact that Yueh was a graduate of the Imperial Suk Academy, thus ensuring loyalty to his employer. However, I'm confused as to who his actual employer was, given his status as an Imperial doctor.
Was Yueh employed and/or a member of the Atreides family, or was he considered an Imperial employee like Dr. Liet Kynes (and therefore a 'contractor' to the Atreides)?