Dr. Robert Riddle is a program director in the Neurogenetics Cluster. Prior to joining NINDS in early 2005, Dr. Riddle was a program director at the National Institute on Drug Abuse. His programmatic interests are neural development and molecular genetics. Specifically, his portfolio in developmental biology contains a number of studies focused on axonal guidance, pattern formation, and cerebellar development. Utilizing both vertebrate and invertebrate animal models is also an interest. Furthermore, Dr. Riddle participates in a number of NIH groups focusing on advancing and distributing mouse mutants. He is a member of a set of trans-NIH committees focused on: genomic resources, mouse knock outs, zebrafish, and RNAi. Prior to coming to the NIH in 2002, Dr. Riddle was a faculty member in the Department of Cell and Developmental Biology at the University of Pennsylvania School of Medicine. He was a postdoctoral fellow in Dr. Cliff Tabin’s lab at Harvard Medical School. He received his PhD in Molecular Biology from Northwestern University.