Children and Adults with Attention-Deficit/Hyperactivity Disorder: 
http://www.chadd.org

Council for Exceptional Children: 
https://www.cec.sped.org/

Learning Disabilities Association: 
http://www.ldanatl.org/

Association for Higher Education and Disabilities: 
www.ahead.org/

Learning and the Brain: 
www.learningandthebrain.com/