Mr Marshall is Rick Marshall, who is still active, and he does DCA seminars occasionally, with Vic Timpanaro of Old Bridge Twp. I'll reserve comment on the 'buster'.
The address on the Certificate of Approval (CA) was the home office for Middle Dept, not necessarily where the inspector was from.
The other 3rd party agencies where BIU (Building Inspection Underwriters) and Garden State Inspection Services. I'm not 100% sure if all three of the 'oldies' are still around. They are recently joined by EIC (Elevator Inspection Corp) which expanded from just elevators, to Bldg, Plumb, Fire & Electric.