The D.C. Maxecuters report that Don Srull died yesterday. What I report today about Don is woefully incomplete, as I am sure that Don had significant contributions in his professional career and is clearly known as an outstanding designer, builder, and flyer of model airplanes.
Don was an inductee into the AMA, NFFS, and the FAC Halls of Fame. He was an early adopter of electric power for Free Flight Scale, starting the Hi-Line company.
Here is a biography from AMA: https://www.modelaircraft.org/sites/default/files/files/SrullDonaldDon.pdf
Here is an article about Don in the Smithsonian Magazine: https://www.smithsonianmag.com/air-space-magazine/modelers-tale-don-srull-interview-model-airplanes-180957297/