Brian F. Thomas, PhD, is Principal Scientist, Analytical Chemistry and Pharmaceutics, at RTI International, NC, USA. He has more than 20 years of experience in analytical chemistry and mass spectrometry. He is the principal investigator/co-principal investigator on two National Institute on Drug Abuse repository and purity specification contracts. His principal duties include overseeing the development of chromatographic assays and spectrophotometric ... Read moreassays for the qualitative and quantitative analysis of bulk chemicals or chemicals in dosage formulations, biological fluids, tissues, or other complex matrices. Dr. Thomas was recently awarded RTI's President's Award for his scientific contributions to the institute. Mahmoud A. ElSohly, PhD, is the director of the Marijuana Project at the University of Mississippi, which is funded by the National Institute on Drug Abuse. He holds more than 30 patents dealing with the processing, testing, and detection of drugs of abuse along with other patents dealing with biologically active natural products and compositions for the treatment of cancer and other in the diagnostics area. He has authored over 250 scholarly articles and more than 200 presentations at scientific meetings of professional societies relative to drug discovery, analysis, and metabolism. He is a member of many scholarly scientific societies and was recognized by The Scientist (April 17, 1995) and Science Watch (January, 1995) as the second most cited author in forensic sciences in the world for the period 1981-1993. Dr. ElSohly is also recognized in the Journal of Analytical Toxicology (October issue, 2004) as being one of the top ten (3rd and 4th) Most Cited Authors and Most Prolific Authors in the journal between 1981 and 2003. Show Less