Deb H
I think you are referring to Dr. Ron Schultz at the University of Wisconsin Vet School. He also runs a titer lab there -- $40 for parvo/distemper titers, a bargain.
He does not recommend every 3 year vaccines. He instead says that after the puppy shots dogs are likely immune for life to parvo/distemper. It is titers they recommend every 3 years (and what I am doing with my dogs). The 7 year study you are talking about is the Rabies Challenge Study.