Professionally Relevant
The are organizations that I have found helpful along the way.

The Gilder-Lehrman Institute of American History
Organization of American Historians
National Council for History Education
Wisconsin Indian Education Association
Teaching History.org
Wisconsin Council for the Social Studies
Wisconsin Historical Society
The Constitution Project
History News Network
What So Proudly We Hail
Cultural Survival

Recommended Scholarship
The following titles highlight some recent reading on my part and, in my estimation, illustrate outstanding scholarship.  

The Revolution Trilogy (Rick Atkinson)

The Indian World of George Washington (Colin Calloway)

Frederick Douglass: Prophet of Freedom (David Blight)

War Under Heaven:  Pontiac, The Indian Nations, and the British Empire (Gregory Evans Dowd)

Citizens of a Stolen Land: A Ho-Chunk History of Nineteenth Century United States (Stephen Kantrowitz)

Race, Removal and the Right to Remain: Migration and the Making of the United States (Samantha Seeley)

Teaching White Supremacy: America’s Democratic Ordeal and the Forging of our National Identity (Donald Yacovone)

Indigenous Continent: The Epic Contest for North America (Pekka Hamalainen)

Summer Study Opportunities
These summer opportunities are invaluable for developing your knowledge base concerning the American story.  

Gilder-Lehrman Summer Institutes
NEH Landmarks of History Programs
Stratford-Hall Plantation Programs