John Tomczyk has worked in refrigeration, heating, and air-conditioning service; project engineering; and technical writing consultation for both the academic and industrial fields. His technical articles have been featured in the Refrigeration News, Service and Contracting Journal and Engineered Systems Journal. He is currently a professor in the Refrigeration, Heating and Air-Conditioning Technology program at Ferris State University with 23 years of teaching experience and a member of the Refrigeration Service Engineers Society (RSES).