Ah, a name from the past!
Paul Chu, after serving as president of the Hong Kong University of Science and Technology, returns to the scene of his triumph at the University of Houston. Back in the heyday of high-Tc superconductors, he discovered YBCO after the publication of Bednorz and Müller's LACO, the first high-Tc superconductor. What was significant about YBCO was that it was the first superconductor discovered that has a Tc above liquid nitrogen temperature. This is important because it allows one to have a superconductor using a relatively cheap cooling source, rather than using liquid helium.
This, of course, was the trigger for the "Physics Woodstock" at the 1987 APS March Meeting in New York. Ah, the good old days!