He was, at least, partly responsible for some of the most influential designs for the British motorcycle industry and worked for Ariel, Norton, BSA and Triumph.
[1] Hopwood left school at an early age to work for Ariel under designer Val Page.
This came to a somewhat acrimonious end when the Technical Director, Joe Craig, refused to release the complete machine for production, despite Norton's financial situation.
When Gibert Smith retired in 1958, Hopwood and the financial director at Bracebridge Street, Alec Skinner, were allowed to get on with taking this part of AMC forward with much improved results.
Recruited by Edward Turner in May 1961, supposedly as his successor, Hopwood was installed as Triumph Director and General Manager.