Possible Clues:

• Endowments org.
• Class-based society?: Abbr.
• “Great public schools for every student” org
• Union for schoolteachers
• "Read Across America" org
• Major lobby in D.C
• Educator’s org.
• Jazz Masters Fellowship-awarding org.
• "Shakespeare in Amer. Communities" co-sponsor
• Gallery-sponsoring org.