Sendivoge, the Secretary of the Guild of Alchemists appears in the background of Moving Pictures as a mildly worried man - probably nervous of being blown up (again...) either by himself or another of the alchemists like his boss, Thomas Silverfish.
Sendivoge is apparently a graduate of the Assassins' Guild school. He may have gone there for the education and left without taking Full Black.
On Roundworld, an alchemist named Michael Sendivogius actually existed. A Pole, his business ethics were more along the lines of CMOT Dibbler than befitted a scientist.