Mark McLinden received his B.S. degree from the University of Missouri-Columbia and M.S. and Ph.D. degrees from the University of Wisconsin-Madison, all in chemical engineering. He joined NIST in 1984 and is the author or coauthor of more than 100 peer-reviewed publications, and has won several awards for his refrigerants research. When not in the lab, Mark enjoys hiking the mountains of Colorado, often carrying 10 kg of large-format, i.e., film-based, old-school, camera gear; he maintains that film is not dead yet and has the landscape photos to prove it.