Mike Hall
From SistersWiki.org - The Sisters Of Mercy Fan Wiki
Mike Hall was nurse to Doktor Avalanche during the Event Horizon Tour in 1998.
He was also mentioned in the front inlay information of the CD-bootleg Event Horizon for this appearance (see picture above).
Mike Hall is mostly known as the long-term tour keyboard technician of Erasure, who didn't tour that year...
but he also worked with Jimmy Somerville, Marc Almond and the Sparks to name just a few.
Here is an old interview with Mike Hall on his musical development and his work with Erasure at waybackmachine
from where we have also captured the very rare photo of him from the old days:
https://web.archive.org/web/20080215082155/http://www.erasureinfo.com/features/privateear_24.html