Practitioners are represented by the International Astrostatistics Association affiliated with the International Statistical Institute, the International Astronomical Union Working Group in Astrostatistics and Astroinformatics, the American Astronomical Society Working Group in Astroinformatics and Astrostatistics, the American Statistical Association Interest Group in Astrostatistics, and the Cosmostatistics Initiative. All of these organizations participate in the Astrostatistics and Astroinformatics Portal Web site.