Thaddeus Loenbrough is an orc considered to be an esteemed photographer as well as the founder of the Royal Photographic Society of Azeroth. He is apparently affiliated with the Alliance as the society is apparently given royal decrees for the glory of the King  as opposed to the Warchief of the Horde.
In lore, it is not uncommon for orcs to side with the Alliance instead of the Horde. Many orcs were raised by humans and identify more with the Alliance than the Horde.(WoWRPG 368)
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.