of the software upon resigning from Inria, and spent a year working it into a fully-featured product, now named Interface Builder and distributed for Macintosh by ExperTelligence in the USA in 1986. It was written in Lisp (for the ExperLisp product by ExperTelligence) and deeply integrated with the Macintosh Toolbox. Interface Builder was presented at MacWorld Expo in San Francisco in January 1987.