Graduate students are encouraged to join professional associations in enology and viticulture if they wish to pursue a career in the field.
The American Society of Enology and Viticulture is the foremost professional association in this field. There is also an ASEV Eastern Section that is focused on eastern viticulture and enology. These organizations have annual conferences as well as job listings to help you network with other professionals and find positions in your field.
Depending on your state or region, there are usually state grape grower and wine maker organizations for you to join. These avenues allow you to network in your state as well as participate in educational opportunities.