International Association for the Scientific Study of Intellectual Disabilities (IASSID) 
An international and interdisciplinary scientific organization to promote worldwide research and exchange of information on intellectual, learning and related developmental disabilities (mental retardation)
http://www.iassid.orgWaisman Center
Mental Retardation Research Center focuses on molecular and genetic sciences. (University of Wisconsin at Madison)
http://www.waisman.wisc.edu/
Donald Beasley Institute
Conducts research and education into the area of intellectual disability/mental retardation. (Dunedin, New Zealand)
http://www.donaldbeasley.org.nz
John F. Kennedy Center for Research on Human Development
Conducts and supports collaborative research, training, and information dissemination on behavioral, intellectual, and brain development. (Vanderbilt University at Nashville)
http://www.vanderbilt.edu/kennedy/
UAB Civitan International Research Center
Coordinates and conducts research related to human development, mental retardation, and developmental disabilities. Links for researchers and families about early child development, neurobiology research and developmental disabilities. (University of Alabama at Birmingham, Alabama)
http://www.circ.uab.edu/
Eunice Kennedy Shriver Center
Promotes understanding of neurological and behavioral development, with special emphasis on mental retardation and other developmental disabilities. (Waltham, Massachusetts)
http://www.umassmed.edu/shriver/
Children's Seashore House
Trains medical professionals in 12 disciplines related to developmental disabilities and mental retardation. (University of Pennsylvania School of Medicine, Philadelphia)
http://www.chop.edu/consumer/jsp/division/service.jsp?id=26666
J P Das Developmental Disabilities Centre
Provides details of research, student training, publications, and clinical services for children and adults. University of Alberta, Canada.
http://www.ualberta.ca/~jpdasddc/INDEX.html
