MLwiN was created by the Centre for Multilevel Modelling team with colleagues in other centres. MLwiN has benefited enormously from the input of numerous people. Michael Healy wrote the original version of NANOSTAT which formed the basis for MLn, a predecessor of MLwiN. Professor Bill Browne provided the foundations and coding of the MCMC features of the software. The (ESRC) have provided essential support over the years.