(1847—1920) A British MD involved with the use of electricity for healing purposes (not electroshock or electroconvulsive treatments). He is most famous, however, for his research into the human aura, including one of the first Western books on the subject, The Human Atmosphere (1911). He believed that the aura was an actual electromagnetic energy and described three levels, coining the terms Etheric Double, Inner Aura, and Outer Aura.

Kilner also developed a training method so that any person could train themselves to see the aura. This involved looking through "Kilner Screens." These were two pieces of glass containing a blue dye made of a substance called dicyanin. While these are claimed to be very successful (indeed, a popular version of them were sold as "Kilner Goggles" or "Aura Goggles"), the problem was that dicyanin was both expensive and toxic. Although actual Kilner Screens or lenses have fallen out of favor, the use of them is sometimes simulated using glass or plastic lenses that are deep cobalt blue or purple. Once you were able to see the aura using this device you were supposed to decrease your use of them as you should be able to see the aura without them.