Today, the 2011 ACM Turing Award has been awarded to Judea Pearl of UCLA:
For fundamental contributions to artificial intelligence through the development of a calculus for probabilistic and causal reasoning.
Pearl pioneered developments in probabilistic and causal reasoning and their application to a broad range of problems and challenges; in particular, creating a computational foundation for processing information under uncertainty, a core problem faced by intelligent systems. His work serves as the standard method for handling uncertainty in computer systems, with applications ranging from natural language understanding and national security, to medical diagnosis and mapping gene expression data. His influence extends beyond artificial intelligence and even computer science, to human reasoning and the philosophy of science.
Read the full award citation.