Craig McKerlie has been writing for more than 15 years. He attended and taught at ITT Tech in Torrance, Calif., and has a B.S. in electronic engineering. McKerlie has worked in the construction trades (plumbing, electrical, carpenter) and in many electromechanical fields. He has been published in eHow, Coffee and Tea Association publication, and numerous user publications for IBM, Belkin Components and Hewlett-Packard.