Donald O’Shea is Emeritus Professor of Physics at Georgia Tech. He served as Editor of Optical Engineering from 1998 to 1999 and 2001 to 2009. He is the author of several textbooks in optics and optical design. His most recent is Designing Optics Using CODE V™ written with Julie L. Bentley (SPIE Press, 2018). Subscriber to TidBITS from when it was distributed in HyperCard format, before the advent of the World Wide Web.