The Wisconsin Twin Research laboratories, directed by Dr. Hill Goldsmith, investigate genetic and environmental features of emotional development from infancy to adolescence. Three major research projects are underway. The Genetics of Emotional Ontogeny (GEO) project examines typical behavioral development from birth to age seven. The Wisconsin Twin Project (WTP) considers both typical development and behavioral problems, and it extends from early childhood to adolescence. The Twin Autism Project (TAP) examines development of children and adolescents on the autism spectrum.