I don't consider Jeff Wall a photographer, more of a digital artist
Until recently, Jeff Wall was one of the largest users of Ilfochrome in the world.
Most of his iconic work is shot on film and was printed optically on to Ilfochrome materials.
I'm not sure if he is using any film now, but he certainly is a photographer.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
Sergei Mikhailovich Prokudin-Gorskii
This guy is pretty interesting as he was making colour photos before colour film was available. He made three B&W exposures through Red, Green & Blue filters & then combined them by projecting through complementary filters. The photos themselves also look great - documentation of Russia in the early 1900s.