Have you tried contacting the below to see if they have any records of past architects?
THE CLERK
Jonathan Soar
clerk@architectscompany.orgClerk to the Worshipful Company of Chartered Architects
The Old Vicarage
Anchor Road
Calne
Wiltshire
SN11 8DR
01249 818664
Or perhaps try contacting the heritage centres for Yorkshire to see if they can help at all?
Any newspaper articles about him which may include a photo?
Added - If he is Edward Maurice Simpson then there are two newspapers reports of him in the Leeds Mercury dated 6th & 10th July 1906
A small snippet in the York Herald 29th March 1889.
I suggest that you check either Find My Past or the British Newspaper Archive for any other reports.