Is he still the main Doctor Who Adventures artist beginning with DWA15 1? Doesn't look that way.
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John Ross drew and inked the Doctor Who Magazine comic stories Me and My Shadow, Uroboros, Sins of the Fathers, Bus Stop!, Spirits of the Jungle and The Stockbridge Showdown (with Dave Gibbons, Roger Langridge, Adrian Salmon, Dan McDaid, Mike Collins, John Ridgway, Martin Geraghty and David A Roach), the comic story Mr Nobody in the Doctor Who Annual 2006, and the Doctor Who: Battles in Time comic story Growing Terror. His strongest connection to the DWU, however, is with Doctor Who Adventures, where he's been the main artist since the first issue.