The Hubble Pre-Symposium is an opening event for the WE-Heraeus-Symposium “The Hubble constant controversy: status, implications and solutions”. The event brings together the experts in the various field of astronomy and astrophysics that are concerned with the determination of H0 and to discuss the most recent results, and possible implications. The Hubble Pre-Symposium takes place on Thursday, 8th November, 2018 at the Leibniz-Institute for Astrophysics Potsdam, Germany.