This supplement to the paper, "Teachers, Schools and Academic Achievement," provides corrections to tables in the original papers along with added technical details to the data, variable definitions and estimation. That paper has two major empirical sections: estimation of the variance in teacher quality and estimation of more traditional education production functions. Both rely upon administrative data for students and teachers from the Texas Education Agency. The microdata are currently aggregate data on school outcomes used in the estimation of the variance in teacher quality are available through this site. In addition to a description of the data and variables, this supplement also includes all of the STATA do-files used for data construction and estimation.