Albert C ParrDr. Parr received an MS and PhD (1970) from the University of Chicago and was involved in research in synchrotron radiation research and development, spectroscopy, and ion chemistry at the National Institute of Standards and Technology (NIST). He joied the Optical Technology Division in 1986 and was active in developing new calibration and measurement strategies based upon the high accuracy cryogenic radiometer. This includes redefinition of the U.S. National SI units of the candela and lumen based upon measurements directly traceable to the cryogenic radiometer. Dr. Parr retired as Chief of the Optical Technology Division in 2007 and continues to consult on radiometric matters related to remote sensing in addition to editor work on the Elsevier series, Experimental Methods in the Physical Sciences. Dr. Parr has published extensively on his research and has over 100 articles in the scientific literature. Read More Read Less