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Published online by Cambridge University Press: 25 May 2016
About 20 years elapsed between my first and second papers on gravitational lenses (Press & Gunn 1973; Press, Rybicki & Hewitt 1992ab). Therefore, the conference organizers have asked me to prognosticate on the future of gravitational lenses. Their reasoning, if I understand it correctly, is that I will likely go to sleep for another 20 years immediately following this conference. So, if I simply look ahead to my very next paper on the subject, I will be in effect prognosticating over two decade's span.