Lee Smith is a Registered Master Plumber and certified vocational math instructor. His many years of practical and teaching experience in the pipe trades includes domestic and industrial work in the areas of refrigeration and air conditioning, deep sea diving vehicles, and nuclear piping. In addition to several certificates in the trades, Mr. Smith has held Master Plumber credentials for ... Read moreforty years. He earned his A.A.in applied science and technology from Thomas A. Edison State College, and his B.A. and M.A. degrees in education from Temple University. Michael A. Joyce is a Class 1 licensed plumbing contractor in North Carolina with thirty three years of plumbing experience in commercial, industrial, and residential installations and repairs. He has authored several plumbing books and teaches a variety of plumbing seminars and classes throughout the country, including classes for the United States Pentagon, New York City hospitals and Plumbing-Heating-Cooling Contractors Association (PHCC) of NC. Currently the President of Joyce Company, Inc., Mr. Joyce is also the owner of the Plumbing Education Station at www.plumbingpro.org. Show Less