John P Colby

Colby had a major impact on the breeding programs of Heinzl, Komosinski, E. Crenshaw, Carver, and Tudor.
Dibo/Colby was one of the most popular crosses of the 1950's, 1960's, and 1970's.

Carver's impact imo was mixed as a breeder and dog broker. The dogs he placed (whether he bred them or not) created most of the popular bloodlines of the last 40 years.

Patrick had a major impact on the breed from the 1970's to the late 1990's. Boyles, Garner, WCC, Hollingsworth, Mickels, and many others created programs that had a major impact in the breed world wide from the 1980's to the 2000's.

I think T. Garner and Southern Kennels had the biggest impact as breeders from the mid 1990's to the present due to the volume of dogs produced and the replication of their genetic blends.