Ray C. Mullin is a former electrical instructor for the Wisconsin Schools of Vocational, Technical and Adult Education. Prior to his retirement, he served as district manager, regional manager, regional vice president and ultimately director technical liaison for a major electrical manufacturer. He also served on the National Fire Protection Association (NFPA) Code Making Panel 4 of the National Electrical Code (NEC). A former journeyman and supervisor for residential, commercial and industrial installations, Mr. Mullin has taught electrical apprentice and journeyman courses, conducted numerous technical and code seminars, written many articles for electrical trade publications and consulted for electrical equipment manufacturers on legal issues. He is also a former member of the Executive Board of the Western Section of the International Association of Electrical Inspectors and a member of the Institute of Electrical and Electronic Engineers and NFPA, Electrical Section. Mr. Mullin attended the University of Wisconsin, Milwaukee School of Engineering, and Colorado State University.

Sandy Gerolimon is a program coordinator in the Electrical Techniques program at Humber College Faculty of Applied Science and Technology and has also taught in the Electrical Apprenticeship Program in Toronto. He joined Humber College in 2000 after working for a generator manufacturer assisting in co-generation projects prior to working as a senior engineer for a guidance system company. He also holds the Canadian Fire Alarm Certificate, which he developed and taught at night school for Humber College. While working part time at Humber College, before becoming a permanent employee, he developed courses for the 309D Electronic Endorsement Apprenticeship program that is still in use today. After teaching as a professor for 14 years in the Electrical Apprenticeship Program, Gerolimon took on the role of Electrical Techniques Program Coordinator and ran the program until June 2021. He has now retired from Humber College. Gerolimon is a coauthor of Electrical Wiring: Residential, published by Cengage Canada.

Ron Granelli is a professor in the Humber College School of Applied Technology''s Electrical Apprenticeship Program in Toronto since 2001. Granelli holds a diploma in Electronic Engineering Technology from DeVry Institute of Technology. He has over 39 years'' experience in the electrical field, including 30 years as a Licensed Master Electrician. He owned and operated an electrical contracting business that performed industrial, commercial, and residential work for over 10 years before joining Humber full time in 2005. Granelli is a coauthor of Electrical Wiring: Residential and Electrical Wiring: Industrial, published by Cengage Canada.

Craig Trineer is a professor in the Electrical Techniques certificate program in the Humber College Faculty of Applied Science and Technology and has also taught the Electrical Apprenticeship Program in Toronto. Trineer holds a master''s degree in Adult Education from Central Michigan University, having earned an undergraduate degree in Psychology from Concordia University in Montreal followed by a Construction and Maintenance Electricians License. He joined Humber College in 2001 after working for several years in the oil industry as an electrician and then as Senior Training Coordinator in a refinery. Trineer is a coauthor of Electrical Wiring: Residential and Electrical Wiring: Industrial, published by Cengage Canada.