Roy Clark is a retired engineer with over 30 years of experience in new product and process development, including optical and spectroscopic measurements in adverse environments. He has successfully integrated complex laser diagnostics into large-scale hypersonic and high-energy laser test facilities. He has also developed LED and fiber optic illumination systems and sensors for a wide range of applications. His spectroscopic experience extends from 200 nm to 200 cm^-1 including work with circular and linearly-polarized light. His interests also include time-based optical calibration techniques that are directly traceable to the primary atomic clock standard.

He has worked at several large and small companies in Southern California and has provided consulting services for optical systems development. He has 8 U.S. patents. He received his MA in chemistry from the University of Oxford University and his Ph.D. in chemical physics from Sussex University (UK; 1976).

He started his own independent research on climate change in 2007. His particular interest is time-dependent or dynamic-surface energy transfer and the calculation of surface temperatures from first principles. He has published several technical articles on climate change and co-wrote the book ‘Finding Simplicity in a Complex World – The Role of the Diurnal Temperature Cycle in Climate Energy Transfer and Climate Change’ with the late Prof. Arthur Rörsch.