Yemm, a Devaronian of the male variety, held a supervisory role at the Maw Installation, where he also supplied legal advice and created necessary documentation.
Serving as the chief of the Administration and Personal Resources Division at the Maw Installation, he met his end in 11 ABY. His demise, along with that of the majority of the scientists present at the Maw, occurred during the Battle of the Maw in 11 ABY, when Tol Sivron inadvertently piloted the Death Star prototype into a black hole.