PERRY W. LANKFORD, P.E., is Executive Vice President of Eckenfelder, Inc., Nashville, Tennessee, serving as Principal-In-Charge on major projects in industrial wastewater treatment, groundwater treatment, and toxicity reduction. He also serves as a lecturer and course director at Vanderbilt University in Nashville and at The Center for Professional Advancement in East Brunswick, New Jersey. The author of numerous technical papers ... Read moreand manuals, Mr. Lankford is a member of the American Society of Civil Engineers, Water Pollution Control Federation, International Association of Water Pollution Research and Control, and the American Institute of Chemical Engineers. W. WESLEY ECKENFELDER, JR., P.E., is Chairman Emeritus and Senior Technical Director of Eckenfelder, Inc., Nashville, Tennessee, overseeing projects for industrial treatment facilities and municipal and industrial waste treatment. Recognized as one of the foremost authorities on industrial water quality management, he is the author of Industrial Water Pollution Control (Revised Edition, 1989), Principles of Water Quality Management (1980), Water Quality Engineering for the Practicing Engineer (1970), and many other books. Mr. Eckenfelder served as president and founding member of the International Association of Water Pollution Research and Control, and is a Fellow of the Institution of Public Health Engineers, American Association for the Advancement of Science, and American Institute of Chemists. Show Less