P. M. S. Hacker is the leading authority on the philosophy of Wittgenstein. He is author of the four-volume Analytical Commentary on the Philosophical Investigations (1980-96), the first two volume...
Antoni Rogalski is a professor at the Institute of Applied Physics, Military University of Technology in Warsaw, Poland. He is one of the world’s leading researchers in the field of infrared (IR) o...
Georg Feuerstein, PhD, (1947-2012) is internationally respected for his work on Yoga and is the author of over fifty books. He designed and taught several distance-learning courses on Yoga philosop...