Astronomical Data Analysis Software and Systems XXIX Astronomical Data Analysis Software and Systems XXIX, The ADASS XXIX conference was hosted by ASTRON (Netherlands Institute for Radioastronomy) in collaboration with seven more Dutch institutes: JIVE (Joint Institute for VLBI ERIC), ALMA ARC Leiden, RuG (University of Groningen), Leiden University, SRON (Netherlands Institute for Space Research), RU (University of Nijmegen), and UvA (University of Amsterdam)., Oct 2019, Groningen, Netherlands