2003 

"The Universal Distribution and Machine Learning"
(Video of Lecture) (pdf of Lecture)
 The Kolmogorov Lecture: To celebrate the centenary of Andrey Kolmogorov's birth (25 April 1903),
the Computer Learning Research Centre at Royal Holloway, United Kingdom,
established the University of London Kolmogorov Lecture and Medal
Ray gave the inaugural lecture in 2003.

2005 

"Algorithmic Probability, AI and NKS"
(Video of Lecture)
 Lecture given at 2005 Midwest NKS conference October 2005

2005 

Two M.I.T. Lectures
Lecture 1. Algorithmic Probability.(latex 29K)
(pdf 130K) (ps 210K)
Lecture 2. Applications of Algorithmic Probability.
(latex 15K) (pdf 129K) (ps 227K)
 Lectures given at M.I.T. IAP, January 2005
