DEWALT Trade Reference Series: PAL Publications Authors Biography, Paul Rosenberg, Norm Christopherson and Ray Holclen

The Author Team	Biography
	American Contractors Exam Services has successfully prepared candidates for state required licensing exams since 1991. A team of full-time instructors comprises field experience, training expertise and formal education to formulate an effective and dynamic approach to concisely present pertinent test information in a seminar format. The seminars are conducted throughout the United States utilizing multi-media and interactive technology. Utilizing effective graphics, pictures and bulleted text, complex material is presented in an easy-to-understand format. This simplified approach has led to thousands of success stories and happy clients. One is sure to benefit from any material written or presented by American Contractors Exam Services.
Paul Rosenberg	Paul Rosenberg has an extensive background in the construction, data, electronic, HVAC and plumbing trades. He is a leading voice in the electrical industry with years of experience from an apprentice to a project manager. Paul has written for all of the leading electrical and low voltage industry magazines and has authored more than 50 books. In addition, he wrote the first standard for the installation of optical cables (ANSI-NEIS-301) and was awarded a patent for a power transmission module. Paul currently serves as contributing editor for Power Outlet Magazine, teaches at Iowa State University and works as a consultant and expert witness in legal cases. He speaks occasionally at industry events.
Norm Christopherson	Norm Christopherson has been involved in the HVAC and refrigeration industry since 1970 and has taught at San Jose City College in California for 18 years. He has custom designed and delivered training courses for IBM, The Coca-Cola Company, Ford Motor Company, Advanced Micro Devices, Lockheed Martin, Loral Aerospace, state government agencies and numerous HVAC contractors. He has been a national and local speaker for the Refrigeration Service Engineer’s Society and continues to lecture and present technical seminars nationally. Norm is published regularly in HVAC technical magazines and is the author of several books for the heating and cooling professional. He has successfully owned and operated his own HVAC installation and service business specializing in solving system problems. Norm is a Senior Training Specialist for York UPG International where he develops and presents York training materials. York International manufactures York, Luxaire, Coleman, and Bristol and Fraser Johnston brands.
Ray Holder	Ray Holder has worked in the electrical industry for more than 40 years as an apprentice, journeyman, master, field engineer, estimator, business manager, contractor, inspector, and instructor. Mr. Holder is a graduate of Texas State University and holds a Bachelor of Science Degree in Occupational Education. He was awarded a lifetime teaching certificate from the Texas Education Agency in the field of Vocational Education. He is a certified instructor of electrical trades. His classes are presented in a simplified, easy-to-understand format for electricians. He has taught thousands of students at Austin Community College; Austin Texas Odessa College at Odessa, Texas; Technical-Vocational Institute of Albuquerque, New Mexico; Howard College at San Angelo, Texas, and in the public school systems in Fort Worth and San Antonio, Texas. He is currently Director of Education for Electrical Seminars, Inc. of San Marcos, Texas. Mr. Holder is an active member of the National Fire Protection Association, International Association of Electrical Inspectors, and the International Brotherhood of Electrical Workers.
Adam Ding	Adam Ding is a professional estimator with extensive experience in a variety of commercial, residential, institutional, industrial, and infrastructure projects. He holds a Master’s degree in Building Construction from Auburn University. Adam has had a successful career in estimating projects of different sizes, ranging from large-scale cost planning to detailed trade take-off. Having bid countless construction jobs, he developed a unique and easy-to-understand estimating approach. Adam taught computer classes in Auburn University, and also owns the copyrights for a number of computer estimating programs. Currently a registered member in the Canadian Institute of Quantity Surveyors (CIQS), he continues to provide cost-estimating services to building professionals in North America, Canada and Asia Pacific regions.
William Spence	William P. Spence has authored more than 28 books in the area of Architectural Design and Building Construction as well as 12 books in related Engineering Technology areas. He also has written articles extensively for magazines and journals. Several of his books have been translated into Chinese, Russian, and Spanish. William has been Dean at the College of Technology and a professor of Construction Engineering Technology at the Pittsburg State University in Pittsburg, Kansas. He also worked in the industry as a General Manager and Design Draftsman at manufacturers in Virginia, worked as a cabinetmaker, and became involved in real estate sales and land development in North Carolina. William earned a doctorate as well as a Masters in Education at the University of Missouri. In addition, he earned his Bachelor of Science in Education at Southeast Missouri State University. William has also served in the U.S. Navy. He makes his home in Pinehurst, North Carolina where he is currently writing technical books full time.
Chris Prince	Chris Prince has been involved in construction for the past 15 years with a combination of field experience and training. He has written hours of training courses that have been taught in live classroom settings and has helped more than 10,000 candidates prepare for state licensing exams across the country. Chris has been instrumental in launching an online training program for builders which has included course development for Residential and Commercial contractors with emphasis in building theory, codes, licensing, lien laws, business management, ethics, OSHA, contract law, payroll and project management. Chris is a graduate of Middle Tennessee State University.