Who's behind WhosGotESP


John Dick writes: I'm a research physicist who has spent a career at Caltech and NASA's Jet Propulsion Laboratory. During this time I developed and helped to develop a number of state-of-the-art technologies, published many papers, conference reports and patents, and held significant positions of responsibility. Other technical activities include co-founding two startup companies, both of which have made contributions to technology that are recognized around the world.

Some of my contributions are shown in the diagrams and pictures here. Click on any of them to get more information; right-click to get a better view of the image.

Conventional wisdom is that one shouldn't put equations here, but I'm particularly proud of the two on the left that, together with the diagram between them predicted an effect that is today the primary limitation to the performance of advanced ultra-high stability frequency standards. The first equation defines a sensitivity function g(t), the diagram demonstrates a quantum-mechanical calculation of this function for the case of "Rabi" interrogation (a type often used in frequency standards), and the lower equation calculates the resulting performance limit due to Local Oscillator Aliasing. These equations are universally used by researchers to evaluate the "effect" and by now they're making their way into textbooks.

There, I knew I could shake you off! Just in case you're still here, other technologies shown are electromagnetic resonators for two cryogenic frequency standards (one has been implemented at several locations by the Jet Propulsion Laboratory), and larger resonators developed at Caltech in the 1970's that led to the construction of superconducting heavy ion accelerators at SUNY Stonybrook, Argonne National Laboratories and Oxford University (the Oxford accelerator has been moved twice; it's now at the Australian National University).

The SpringWalker, developed with co-entrepreneur and friend Bruce Crapuchettes and with engineer Eric Edwards in the 90's is still listed as one of the 10 most significant human exoskeletons developed to date. I'd love another shot at that, but the expense. . . .

Finally, I'm also quite proud of the circuit diagram from our U.S. Patent (click on diagram at upper right): It showed why carrier suppression would enable a dramatic reduction in the phase noise of microwave oscillators; I was gratified by a comment by a colleague from the National Institute for Science and Technology (NIST) who accosted me at a conference one year: "Thank God for your work! But for that patent of yours those Australians (a private company that had vigorously moved into the field with subsequent patents) and their lawyers would have completely shut down our low-noise oscillator R&D." Ah Technology!