Howard Yoon, a physicist, researcher, and author, at NIST’s Optical Radiation Group has spent 25 years thinking about how to measure light more accurately. Yoon’s work improves standards that make it possible to use light as a measurement tool. His favorite light wavelength is 650 nanometers, the wavelength historically used for optically determining the temperatures of metals. Yoon earned his master’s degree and Ph.D. in physics from University of Illinois, and bachelor’s degrees in physics and chemistry from Swathmore College. Visit the NIST Publication Portal for more than 100 published manuscripts that Yoon has co-authored.