Apparently an employee of the mysterious establishment where the characters woke up. A note was found in the pocket of a gray orderly’s coat confirming authorization for Linweigh’s “annual increase.” The note was signed “E.L.” The gray coat itself was found on the floor next to the table where the tortured man died.
According to Naysa in Chapter 10, he was an orderly, and a good man.
In Dora’s psychometry vision of Dr. Losandro’s office in Chapter 22, the party learned more about his activities on 17 Lamashan. He was present in the aftermath of the ritual performed by Dr. Losandro from The Chain of Nights, and escorted Zandalus back to his room.
First Reference: Chapter 3
Other Notable References: Chapter 10, Chapter 22