Carey, Susan  
   [Laboratory for Developmental Studies, Harvard] Acquisition of object concepts, numerical abilities in infants. Full-text papers available.
   http://www.wjh.harvard.edu/~lds/carey.html

Spelke, Elizabeth  
   [Laboratory for Developmental Studies, Harvard] Spatial representations in children, objecthood, numerical thinking. Full-text papers available.
   http://www.wjh.harvard.edu/~lds/spelke.html

Gelman, Rochel  
   [RUCCS, Rutgers] Causal and quantitative reasoning, constraints on concept acquisition, perceptual animacy.
   http://ruccs.rutgers.edu/faculty/GnG/gelman.html

Leslie, Alan M.  
   [Cognitive Development Lab, RUCCS, Rutgers] Cognitive architecture in early development, object cognition in infancy, "theory of mind". Presents the lab and current research topics.
   http://ruccs.rutgers.edu/~aleslie/

Keil, Frank C.  
   [Cognition and Development Lab, Yale] Categorization, intuitive theories, conceptual acquisition and change, causal cognition.
   http://www.yale.edu/psychology/FacInfo/Keil.html

Mehler, Jacques  
   [Language, Cognition and Development Lab, SISSA, Trieste, Italy] Language acquisition, phonological bootstrapping, distributional learning.
   http://www.sissa.it/cns/lcd/jacques.htm

Baillargeon, Renee  
   [Department of Psychology, University of Illinois] Infant cognition (acquisition of knowledge about the physical world, causal reasoning, spatial and numerical reasoning) and infant perception (object segregation, time integration).
   http://www.psych.uiuc.edu/people/faculty/baillargeon.html

Vygotsky, Lev  
   (1896-1934) Biography, works and photo archive.
   http://www.marxists.org/archive/vygotsky/

Luria, Alexander R.  
   (1902–1977) Biography, works and photo archive.
   http://www.marxists.org/archive/luria/

Piaget, Jean  
   (1896-1980) Short biography of the french psychologist.
   http://www.piaget.org/biography/biog.html

Gopnik, Alison  
   [Institute of Human Development, Berkeley] Cognition and language development, children's theories of mind. Downloadable fulltext papers.
   http://ihd.berkeley.edu/gopnik.htm

Meltzoff, Andrew  
   [Institute for Learning and Brain Sciences, Washington] Cognitive development, infant imitation and memory, theory of mind and folk psychology.
   http://ilabs.washington.edu/meltzoff/