He was a contemporary of Alex Moore and it was he and his partner Eve Kendall who danced and demonstrated the figures to be studied by a group of experts and described in the 1948 "Revised Technique".
He was very much a ballroom technician and was famous for his technical lectures.
He was injured in a car crash in 1950 which ended his competitive and demonstrating career, but he continued to lecture world-wide and train examiners for several dance societies.
The IDTA asked him to write their technique manual and this was first published in 1976.
There are several very minor differences between the IDTA and ISTD books but the most significant difference is in the foxtrot.
Guy Howard removed the overlap between figures, where the last step of one figure becomes the first step of the next. So a feather ends with the man's RF forward OP, ready for a reverse turn to commence LF.
Where this gets confusing is in the description of the three-step. Since his feather finish ends on man's RF his three-step begins (and ends) with man's LF.
The ISTD three-step begins with man's RF and also ends with the RF which is the first step of the following natural figure. This means the ISTD three-step really only consists of two steps. :)