I will report the mass and radius of the isolated 205 Hz millisecond pulsar PSR J0030+0451 estimated by the members of the Neutron Star Interior Composition Explorer (NICER) team, using the first 18 months of NICER observations of this pulsar, and the implications of these estimates for the equation of state of neutron-star matter. I will describe the analysis of the observations performed by the Illinois-Maryland collaboration and the results obtained by this collaboration. These results were obtained using a Bayesian inference approach to analyze this pulsar's energy-dependent soft X-ray pulse waveform. I will describe the data we used, how we processed the data, our theoretical modeling of the pulse waveform, and how we approached and solved the parameter estimation problem. I will answer questions about the data, analysis, and results. Discussion will be encouraged.
