Cognitive development in children: Genetic markers NICHD (2001-2004, PI). Transition in to early adolescence: A twin adoption study NIMH (2000-2005, Co-I with John DeFries, University of Colorado). Subcontract to Institute of Psychiatry 2000-05. Determinants of behavioral development in children NICHD (2003 - 2007, Co-I with John DeFries, University of Colorado). Subcontract to Institute of Psychiatry 1998-03. Genetic and environmental origins of mild mental impairments and behaviour problems in early development MRC (2000-2005, PI). Genetics and anxiety/depression in 25,000 sibs MRC (2000-2003, Co-I). Genetic mapping of quantitative trait loci for anxiety and depression MRC (2000-2004, Co-I with Pak Sham, SGDP Centre). Mathematics cognition and specific learning disabilities NIH (2003-2006, Co-I with Steve Petrill, Penn State University). Subcontract to Institute of Psychiatry Available for print