TTB collects data on all beer produced not just Craft Beer. They do not define just Craft Beer. It is generally defined however as beer produced in less than 6 million barrels. Sierra Nevada, Samuel Adams and Lagunitas are in the high end of Craft Beer producers and are not owned by more than 25% of a Macro Brewery.
This is not a scientific paper defining hop research and new findings, we only want to show just how extensive and all encompassing hops research has become. Almost every state university has hop research efforts of some sort. Even the hop farms have research to improve plant health and quality and sustainability. Amen to that.