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Roger L. McMullen has 24 years of experience as a Principal Scientist at Ashland Inc, where they lead the Materials Science department and focuses on personal care. Roger L. is responsible for developing innovative technologies for measuring consumer-perceivable properties of personal care products. Roger L. also has experience as an Adjunct Professor at Fairleigh Dickinson University, teaching Microtoxicity and Biochemistry to students pursuing M.S. degrees in Cosmetic Science and Pharmaceutical Chemistry. Additionally, McMullen served as the Editor-in-Chief at Cosmetiscope and worked as an Assistant Personnel Officer in the US Navy.

Roger L. McMullen earned a Bachelor of Science degree in Chemistry from Saint Vincent College in 1996. Roger L. went on to pursue a Master of Science and Doctorate degree in Biophysical Chemistry at Seton Hall University from 1997 to 2005.