Charles Mark McClung began as an electrician apprentice with Union Carbide Corporation in 1974. After working 12 years as an electrician, he held various management and technical positions in plant maintenance and utility distribution. After a 35-year career, he took early retirement to devote his full attention to the development, manufacturing, and marketing of electrical safety devices. He founded Martek Limited, which was acquired by CBS ArcSafe in 2018.